Natsu will have 6 kids with every woman in Fairy Tail 3 boys and 3 girls.

There will be aged up characters.

Natsu x Lisanna:
Shad
Alice
Law
Kelly
Ray
Piper

Natsu x Erza:
Cody
Dawn
Rock
Roxan
Scott
Mia

Natsu x Mirajane:
Tony
Nina
Randy
Sandy
Brody
Ava

Natsu x Hisui:
Bruce
Violet
Sai
Bella
Noah
Abigail

Natsu x Sorano:
Andy
Bonney
Cole
Lola
Ethan
Olivia

Natsu x Yukino:
Mason
Fuyu
Zack
Molly
Brock
Peyton

Natsu x Minerva:
Ace
Trish
Rex
Brenda
Omar
Alexandra

Natsu x Kagura:
Jeffrey
May
Tyler
Sally
Joel
Nicole

Natsu x Flare:
Felix
Mai
Seth
Romina
Brady
Vanessa

Natsu x Kamika:
Luis
Karin
Arturo
Victoria
Xander
Amber

Natsu x Cosmos:
Mario
Yi
Liu
Carrie
Zane
Ximena

Natsu x Cana:
Andrew
Ursula
Haku
Nora
Spencer
Heaven

Natsu x Jenny:
Joey
Daisy
Johnny
Fionna
Cruz
Skyler

Natsu x Juvia:
Zeke
Hana
Ash
Tanya
Ronald
Lia

Natsu x Kinana:
Roger
Diane
Shawn
Yoshino
Rory
Holly

Natsu x Laki:
Harry
Trixie
Bryan
Hillary

Natsu x Brandish:
Butch
Monet
Alberto
Ivy

Natsu x Dimaria:
Yamato
Indy
Sam
Lynn

Natsu x Kyoka:
Asrael
Umbra
Damian
Tenebra

Natsu x Seilah:
Draven
Anubis
Lucifer
Circe
Akuma
Asura

Natsu x Sherry:
Jake
Karai
Marco
Miranda

Natsu x Millianna:
James
Sophia
Jimmy
Anne

Natsu x Ultear:
Elliot
Shizuka
Nick
Amy

Natsu x Meredy:
Gary
Robin
Ben
Kin

Natsu x Irene:
Tyson
Hailey
Greg
Crimson

Natsu x Layla:
Jerry
Zoe
Teach
Sakura

Natsu x Ur:
Kidd
Vivi
Logan
Miley

Natsu x Bisca:
Lee
Iris
Brook
Jade

Natsu x Wendy:
Peter
Lindsey
Will
Susan

Natsu x Sherria:
Cyrus
Wanda
Kyle
Lori

Natsu x Lucy:
Ralph
Judy
Patrick
Sandra

Natsu x Levy:
Duke
Heather
Cory
Tina

Natsu x Araña:
Steve
Emily
Stan
Kira

Natsu x Risley:
Josh
Riruka
Matt
Mindy

Natsu x Ikaruga:
Nedd
Haruka
Tripp
Nova

Natsu x Mary:
Bart
Tsunami
Darwin
Naomi

Natsu x Evergreen:
Phill
Carol
Oscar
Momo

Natsu x Karen:
Homer
Sonya
Kevin
Aura

Natsu x Haine:
Nelson
Moshiro
Iori
Jillian

Natsu x Juliet:
Ryan
Dinna
Dexter
Melina

Natsu x Coco:
Eddie
Deedee
Alvin
Megan

Natsu x Lamy:
Yama
Moira
Amaymon
Nocturna

Natsu x Beth:
Bray
Bianca
Kon
Rin

I know really long list. I just felt inspired.

Most of the names belong to my friends in real life. Some belong to other characters from videogames and anime characters. Some to demons. And some I made em up.

This is NOT an ORIGINAL story. The Original one belongs to THEUNKNOWNLEGION. Make sure to check out his story on FANFICTION. The title is
The Children Of The Future. It's an awesome story.