(The adults are listed first, even the ones only with two chapters worth of cameos, since these are the characters that we've known the longest from WCTVD and WCTO.)

Name: Kaylin Salvatore-Mikaelson

Nickname: Kay

Eye Color: Bright blue

Hair color: Blonde

Family: 

Biological: Salvatore

By Marriage: Mikaelson (married to Klaus)

Giuseppe and Lily Salvatore - Parents

Stefan and Damon Salvatore - Brothers

Nicola Salvatore-Mikaelson - Great-great-great-great niece

Rae Salvatore-Mikaelson - Daughter

Hope Mikaelson - Stepdaughter

Madison Fell-Mikaelson - Adoptive niece

Kassandra, Rebekah, Elijah, Kol, Finn and Freya Mikaelson - Sisters and brothers in law through the Mikaelson side

Lucien Castle (Kassandra's husband), Eliza Forbes-Mikaelson (Kol's wife), Keelin Mikaelson (Freya's wife) - In laws through the Mikaelson side

Alex and Elena Gilbert/Salvatore and Liv Gilbert/Hunter and Cristian Hunter - Sisters and brother in law through the Salvatore side

Stefan/Alex, Damon/Elena, Liv/Cristian's kids - Nieces and nephews

Distantly related to Tory and Lyla Thompson and Maia due to being descendants of Silas and Rosalita (brother and sister)

Species: Vampire (Klaus's sireline)

Fanfiction Books: Satisfy Series

1 - Satisfy

2 - Amists 

3 - Insatiable

4 - Recondite

5 - Chaos

6 - Coalesce

7 - Apocalyptic

8 - Detached

9 - Resurrection

10 - Loathe Goodbyes

Character Creator: TVDlover97

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Name: Nicola Salvatore-Mikaelson

Nickname: Nikki

Eye Color: Brown

Hair Color: Brunette

Family: 

Biological: Salvatore

By marriage: Mikaelson (married to Elijah)

Giuseppe and Lily Salvatore - Great-great-great-great-great grandparents

Stefan & Damon Salvatore and Kaylin Salvatore-Mikaelson - Great-great-great-great uncles and aunt

Rae Salvatore-Mikaelson (Kaylin's daughter), Sarah and Stephanie Salvatore {Stefan/Alex and Damon/Elena's daughters) - Great-great-great aunts / Nieces

Zach and Monica Salvatore - Parents

Alex and Elena Gilbert/Salvatore and Liv Gilbert/Hunter and Cristian Hunter - In laws through the Salvatore side

Kassandra, Rebekah, Klaus, Kol, Finn & Freya Mikaelson - Sisters and brothers in law through the Mikaelson side

Lucien Castle (Kassandra's husband), Eliza Forbes-Mikaelson (Kol's wife), Keelin Mikaelson (Freya's wife) - In laws through the Mikaelson side

Hope Mikaelson - Step niece

Madison Fell-Mikaelson - Adoptive niece

Anna, Isaac and Isaiah Hunter (Liv and Cristian's kids) - Step niece and nephews

Distantly related to Tory and Lyla Thompson and Maia due to being descendants of Silas and Rosalita (Brother and sister)

Species: Vampire / Huntress

Fanfiction Books: Zach's Daughter Series

1 - Zach's Daughter

2 - Trouble

3 - Reverse Psychology

4 - Potential

5 - Bad Feelings

6 - Visitation

7 - My Return

8 - Never Let Me Go

9 - Huntress in New Orleans

10 - Fighting Fate

Character Creator: PLLTWTVD1997

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Name: Lindsey Davis-Thompson

Nickname: Linds

Eye Color: Brown

Hair Color: Brunette

Family: 

Biologically: Davis

By Marriage: Thompson (married to Ryan)

Ovisona (Qetsiyah's sister) - Ancestor/Lindsey is the Doppelganger of Ovisona

Qetsiyah - Ancestral Aunt

Mercy Davis - Ancestor/Lindsey and Mercy are the Doppelgangers of Ovisona

Courtney and Daniel Davis - Parents

Ryan Thompson - Husband

Luke Thompson - Brother in law

Tory Thompson and Kacie Lockwood - Sisters in law

Emma and Danny Davis-Thompson - Daughter and son

* Note: Due to the fact that Lindsey and Ryan helped Freya and Keelin have their son Nick, Nick is also genetically their son, and half brother to Emma and Danny*

Mikayla Labonair-Lockwood - In law through Kacie

Ariara Nata - Adoptive niece in law 

Distantly related to the Bennetts through being descendants of Ovisona and Qetsiyah

Species: Doppelganger of the Davis line, Witch

Character Creator: heartofice97

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Name: Tory Thompson

Nickname: Tor, Tor-Tor

Eye Color: Green

Hair Color: Red

Family:

Rosalita - The originator of the Luna Doppelgangers, Ancestor

Silas - Rosalita's brother, distant uncle

Luna - The second known Luna Doppelganger (the line named after her)

Amelia Donovan and Richard Lockwood - Parents

Carol Lockwood - Stepmother

Kelly Donovan - Maternal aunt

Mason Lockwood - Paternal uncle

Kacie and Tyler Lockwood - Half siblings

Ash and Michael Donovan - Dead brothers

Matt and Vicki Donovan - Cousins

Luke Thompson - Husband

Lyla Thompson - Daughter

Ryan Thompson and Lindsey Davis-Thompson - Brother and sister in law through Luke

Emma and Danny Davis-Thompson - Niece and nephew

Mikayla Labonair-Lockwood - Sister in law through Kacie

Ariara Nata - Adoptive niece

* Note: Due to the fact that Lindsey and Ryan helped Freya and Keelin have their son Nick, Nick is also genetically their son, and half brother to Emma and Danny, making him the nephew to Tory and Luke*

Distantly related to the Salvatores and Maia due to being descendants of Silas and Rosalita (brother and sister)

Species: Tribrid, Psychic

Character creator: heartofice97

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Name: Lucas Thompson

Nickname: Luke (goes by)

Eye Color: Brown

Hair Color: Black

Family: Thompson 

Emma and Malik Thompson - Parents

Tory Thompson - Wife

Lyla Thompson - Daughter

Ryan Thompson - Brother

Lindsey Davis-Thompson and Kacie Lockwood - Sisters in law

Emma and Danny Davis-Thompson - Niece and Nephew

* Note: Due to the fact that Lindsey and Ryan helped Freya and Keelin have their son Nick, Nick is also genetically their son, and half brother to Emma and Danny, making him the nephew to Tory and Luke*

Mikayla Labonair-Lockwood - In law through Kacie

Ariara Nata - Step adoptive niece

Species: Hybrid

Character Creator: heartofice97

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Name: Ryan Thompson

Nickname: Ry

Eye Color: Brown

Hair Color: Black

Family: Thompson

Emma and Malik Thompson - Parents

Luke Thompson - Brother

Lindsey Davis-Thompson - Wife

Tory Thompson and Kacie Lockwood - Sisters in law

Emma and Danny Davis-Thompson - Daughter and son

Mikayla Labonair-Lockwood - In law through Kacie

Ariara Nata - Step adoptive niece

* Note: Due to the fact that Lindsey and Ryan helped Freya and Keelin have their son Nick, Nick is also genetically their son, and half brother to Emma and Danny*

Species: Werewolf

Character Creator: heartofice97

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* Kacie is not in every chapter

Name: Kacie Lockwood

Nickname: Kace

Eye Color: Green

Hair Color: Brunette

Family:

Biologically: Lockwood

By marriage to Mikayla: Labonair

Carol and Richard Lockwood - Parents

Mason Lockwood - Uncle

Tyler Lockwood - Brother

Tory Thompson - Half sister

Ash and Michael Donovan - Dead half brothers

Luke and Ryan Thompson - Brother in laws

Lindsey Davis-Thompson - Sister in law

Emma and Danny Davis-Thompson and Nick Mikaelson - Niece and nephews

Mikayla Labonair-Lockwood - Wife

Hayley Marshall - Dead sister in law

Hope Mikaelson - Step niece

Ariara Nata - Adoptive daughter

Species: Hybrid

Character Creator: heartofice97

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* Mikayla is not in every chapter

Name: Mikayla Labonair-Lockwood (formerly Mikayla Labonair-Kenner)

Eye Color: Brown

Hair Color: Dark Brown

Family:

Biological: Labonair

Adoptive: Waters

New Marriage: Lockwood (to Kacie)

Hayley Marshall - Dead sister

Hope Mikaelson - Niece

The Mikaelsons - Extended Family

Riley Grey - Dead brother in law

Kacie Lockwood - Wife

Tory Thompson and Lindsey Davis-Thompson - Sisters in law

Luke and Ryan Thompson - Brothers in law

Emma & Danny Davis-Thompson, Lyla Thompson and Nick Mikaelson - Step nieces and nephews

Ariara Nata - Adoptive daughter

Species: Hybrid

Character Creator: heartofice97

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* Eliza is not in every chapter

Name: Eliza Forbes-Mikaelson

Nickname: Liza

Eye Color: Hazel

Family:

Biological: Forbes

By Marriage: Mikaelson (married to Kol)

Liz and Bill Forbes - Parents

Caroline Forbes-Saltzman - Sister

Alaric Saltzman- Brother in law through the Forbes side

Hope Mikaelson, Rae Salvatore-Mikaelson, Lizzie and Josie Saltzman - Step nieces

Nick Mikaelson - Step nephew

Kol Mikaelson - Husband

Madison Fell-Mikaelson - Adoptive daughter

Kassandra, Klaus, Elijah, Rebekah, Finn & Freya Mikaelson - Sisters and brothers in law through the Mikaelson side

Lucien Castle (Kassandra's husband), Kaylin Salvatore-Mikaelson (Klaus's wife), Nicola Salvatore-Mikaelson (Elijah's wife), Keelin Mikaelson (Freya's wife) - In laws through the Mikaelson side

Species: Vampire (Klaus's sireline)

Character Creator: mysticfalls1997 (originally), heartofice97

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Name: Rosalita

Nickname: Rosa

Eye Color: Hazel

Hair Color: Red / Strawberry Blonde

Family:

Silas - Brother

Tory Thompson and Luna - Descendants/Doppelgangers

Lyla Thompson and Maia - Descendants

Amelia, Ash and Michael Donovan - Dead Descendants

Stefan & Damon Salvatore, Kaylin, Nicola & Rae Salvatore-Mikaelson (plus Stefan/Alex & Damon/Elena daughters Sarah and Stephanie) - Distantly related nephews and nieces

Species: Psychic Witch/Ghost / The Devil

Character Creator: heartofice97

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(There are other surprise one chapter cameos from WCTVD/WCTO characters)

The Teens/Kids:

Name: Rae Salvatore-Mikaelson

Nickname: Rae-Rae

Eye Color: Blue/Hazel

Hair Color: Blonde

Family: Salvatore/Mikaelson

Kaylin Salvatore Mikaelson - Mother

Stefan and Damon Salvatore - Uncles

Nicola Salvatore-Mikaelson - Great-great-great niece / Aunt

Klaus Mikaelson - Stepfather

Hope Mikaelson - Stepsister

Madison Fell-Mikaelson  - Step adoptive cousin

Kassandra, Rebekah, Elijah, Kol, Finn & Freya Mikaelson - Step aunts and uncles through the Mikaelson side

Lucien Castle (Kassandra's husband), Eliza Forbes-Mikaelson (Kol's wife), Keelin Mikaelson (Freya's wife) - Step aunt and uncle in laws through the Mikaelson side

Alex and Elena Gilbert/Salvatore, Liv Gilbert/Hunter and Cristian Hunter - Step aunts and uncle through the Salvatore side

Stefan/Alex, Damon/Elena, Cristian/Liv's kids - Cousins (Sarah for Stefan and Alex's daughter, Stephanie for Damon and Elena's daughter, and Anna, Isaiah and Isaac for Cristian and Liv's kids)

Distantly related to Tory and Lyla Thompson and Maia through being descendants of Silas and Rosalita (Brother and sister)

Species: Psychic Immortal

Age: 17 (due to Hollow linking her age to Hope's)

Fanfiction Books: Satisfy Series

1 (7) - Apocalyptic (introduced in theory and dreams)

2 (8) - Detached (brought back by Cade)

3 (9) - Resurrection

4 (10) - Loathe Goodbyes

Character Creator: TVDlover97

* Note: Rae still has Rosalita locked away inside her to keep the spirit from causing any havoc, but sometimes Rosalita can reach through and still use her magic to torment others or just to play games with everyone sadistically. Klaus, Elijah, Eliza and Kol are mostly gone looking for ways to rid Rae of Rosalita without releasing her and starting a war with her all over again, while also looking for a cure to Nicola's Huntress, and Kassandra's sketchy madness.

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Name: Emma Davis-Thompson

Nickname: Em

Eye Color: Brown

Hair Color: Black

Family: Davis-Thompson

Ovisona (Qetsiyah's sister) and Mercy Davis - Ancestors

Qetsiyah - Ancestral Aunt

Courtney and Daniel Davis - Maternal grandparents

Emma and Malik Thompson - Paternal grandparents

Lindsey Davis-Thompson and Ryan Thompson - Parents

Luke Thompson - Uncle

Tory Thompson and Kacie Lockwood - Aunts

Danny Davis-Thompson - Twin brother

Lyla Thompson - Cousin

Mikayla Labonair-Lockwood - Step Aunt

Hope Mikaelson - Step Cousin

Ariara Nata - Adoptive Cousin

* Note: Due to the fact that Lindsey and Ryan helped Freya and Keelin have their son Nick, Nick is also genetically their son, and half brother to Emma and Danny, making him the nephew to Tory and Luke*

Distantly related to the Bennetts through being descendants of Ovisona and Qetsiyah

Species: Witch, werewolf

Age: 17 (due to Hollow linking her age to Hope's)

Character creator: heartofice97

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Name: Daniel Davis-Thompson

Nickname: Danny (goes by)

Eye Color: Brown

Hair Color: Black

Family: Davis-Thompson 

Ovisona (Qetsiyah's sister) and Mercy Davis - Ancestors

Qetsiyah - Ancestral Aunt

Courtney and Daniel Davis - Maternal grandparents

Emma and Malik Thompson - Paternal grandparents

Lindsey Davis-Thompson and Ryan Thompson - Parents

Luke Thompson - Uncle

Tory Thompson and Kacie Lockwood - Aunts

Emma Davis-Thompson - Twin sister

Lyla Thompson - Cousin

* Note: Due to the fact that Lindsey and Ryan helped Freya and Keelin have their son Nick, Nick is also genetically their son, and half brother to Emma and Danny, making him the nephew to Tory and Luke*

Distantly related to the Bennetts through being descendants of Ovisona and Qetsiyah

Species: witch, werewolf

Age: 17 (due to Hollow linking his age to Hope's)

Character Creator: heartofice97

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Name: Madison Fell-Mikaelson

Nickname: Maddie / Mads

Eye Color: Brown

Hair Color: Blonde

Family: Fell (by birth), Mikaelson (adopted)

Kol Mikaelson and Eliza Forbes-Mikaelson - Adoptive parents

Kassandra, Klaus, Elijah, Rebekah, Finn & Freya Mikaelson - Adoptive aunts and uncles through the Mikaelson side

Caroline Forbes-Saltzman - Adoptive aunt through the Forbes side

Lucien Castle (Kassandra's husband), Kaylin Salvatore-Mikaelson (Klaus's wife), Nicola Salvatore-Mikaelson (Elijah's wife), Keelin Mikaelson (Freya's wife) - Step adoptive aunts and uncle through the Mikaelson side

Hope and Nick Mikaelson - Adoptive cousins

Rae Salvatore-Mikaelson - Step adoptive cousin through the Mikaelson side

Lizzie and Josie Saltzman - Step adoptive cousins through the Forbes/Saltzman side

Species: Banshee

Age: 17

Character Creator: heartofice97 (plus ideas for this character come from FanOfTV, and idea for Kol and Eliza to have an adoptive child comes from MakiSakura)

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Name: Ariara Nata

Nickname: Ari / Ara

Eye Color: Brown

Hair Color: Black

Family: 

Queen Acquilina Nata  - Mother (Dead)

King Ahish Nata - Father (Dead)

Prince Acilino Nata - Older Brother (Dead)

Princess Arlette Nata - Younger Sister (Dead)

After her family and kingdom was wiped out, Kacie and Mikayla found her in recruitment for the boarding school, and took her in as their own.

Kacie Lockwood and Mikayla Labonair-Lockwood - Adoptive mothers

Tory, Luke & Ryan Thompson and Lindsey Davis-Thompson - Adoptive aunts and uncles

Hope & Nick Mikaelson, Emma & Danny Davis-Thompson, and Lyla Thompson - Adoptive cousins

Species: Animal Shapeshifter

Age: 17

Character Creators: heartofice97/FanOfTV

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Name: Owen Church

Eye Color: Blue

Hair Color: Brunette

Family: (was a foster child bouncing from home to home. Last name is Church due to foster care. Foster brother to Landon and Rafael. His real family (both sides) will be revealed during this book)

Species: To Be Revealed

Age: 17

Character Creators: heartofice97/FanOfTV

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Name: Lyla Thompson

Eye Color: Blue/Brown

Hair Color: Light Brown

Rosalita - Ancestor

Silas - Ancestral uncle

Amelia Donovan and Richard Lockwood - Maternal grandparents

Emma and Malik Thompson - Paternal grandparents

Kelly Donovan - Maternal great-aunt

Mason Lockwood - Paternal great-uncle

Tory and Luke Thompson - Parents

Kacie Lockwood - Maternal Aunt

Tyler Lockwood & Ash and Michael Donovan - Maternal Uncles

Ryan Thompson - Paternal Uncle

Lindsey Davis-Thompson and Mikayla Labonair-Lockwood - Step aunts

Emma & Danny Davis Thompson and Nick Mikaelson - Cousins

Hope Mikaelson - Step cousin

Ariara Nata - Adoptive Cousin

Distantly related to the Salvatores and Maia due to being descendants of Silas and Rosalita (brother and sister).

Species: Tribrid Psychic (siphoner with psychic abilities like Tory)

Age: 9

Character Creator: heartofice97

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Cast: (listed as pictures and profiles were shown, adults first, teens/kids last)

Ashley Benson - Kaylin Salvatore-Mikaelson

Zoey Deutch - Nicola Salvatore-Mikaelson

Jessica Parker Kennedy - Lindsey Davis-Thompson

Maia Mitchell - Tory Thompson / Rosalita

Tyler Posey - Luke Thompson

Tyler Hoechlin - Ryan Thompson

Lucy Hale - Kacie Lockwood

Emeraude Toubia - Mikayla Labonair-Lockwood

Dianna Agron - Eliza Forbes-Mikaelson

Jordyn Jones - Rae Salvatore-Mikaelson

Amanda Hummer - Emma Davis-Thompson

Aramis Knight - Danny Davis-Thompson

Peyton List - Madison Fell-Mikaelson

Sofia Carson - Ariara Nata

Cody Christian - Owen Church

Willow Morgan - Lyla Thomspon

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Ships:

From WCTVD and WCTO relevant to Legacies:

Tory + Luke - Lory

Lindsey + Ryan - Lyan

Mikayla + Kacie - Mikacie

Klaus + Kaylin - Klaylin

Elijah + Nicola - Nicolijah

Eliza + Kol - Koliza

Teen Couples/For Legacies

Rae + Danny - Dae

Emma + Rafael - Rafemma

Madison Fell-Mikaelson + Owen Church - Mowen or Fell Church

Ariara + Josie - Jariara / Ariara + Penelope = Peniara / all three = Posiara

Hope + Landon - Handon