Ok y'all, here are some of my favorite songs (NOT the charts) in Cytus II, Arcaea, Phigros, Dynamix, Rotaeno, and Colorful Stage. Fair warning, I am terrible at narrowing things down.

I'll go by character for Cytus II (of the characters that I have)

PAFF: SECRET;WEAPON, Bullet Waiting for Me, Baptism of Fire, More than Diamond
NEKO: Chrome VOX, Keep It Up, Brain Power, Blow My Mind
ROBO: Grimoire of Crimson, Restriction, Deadly Slot Game, Dead Point
Ivy: Alexandrite, Sovereign, Summer Zephyr, V., Still (Piano Version)
CrystalPunk: Dark Madness, Effervesce, Chandelier XII, βinαrΨ
Vanessa: Ra, Anchor, II, Used To Be
Bo Bo: King of Desert, Firstborns, Quinsailyn, The Breath of the Soul
Xenon: Phantom Razor, Black Hole, Karma, Asylum, Chosen
ConneR: Fur War Pur War, Floor of Lava, Re:Boot, L'Ultima Cena, Demetrius
Rin: The Siege, Inari, (the song i one-hand jack that one part)
Sagar: Portent of the Silver Wheel, Legacy, Nídhögg, Space Alien
Joe: Turnstile Jumper, Take me to the Future, Bass Music, Standby for Action
Cherry: LEVEL4, CREDENCE, I'M NOT, hunted
Nora: Accelerator, Bastard of Hardcore, Drop The World, Starlight (KIVA remix), Eternity
Aroma: (hyou ryuu), Make U Mine, Perspectives, Anzen Na Kusuri
Neko: DJ Mashiro is Dead or Alive, Blah!!, I can avoid it., (Apo11o Program)

Songs I don't have (probably will never purchase them):

Any of the Miku songs 
Any of the Hardcore TANO*C collab songs
VIS::CRACKED
Oshama Scramble!
[SILENT [[• - •]] MOMENT]
DON'T LISTEN TO THIS WHILE DRIVING
Heat Ring
What's Your PR.Ice?
Red Five
Ramen is God
Hydra
LOUDER MACHINE
Jazzy Glitch Machine

And now my favorite songs from Arcaea. 

Base Arcaea pack: Dement ~after legend~, world.execute(me);, Purgatorium, Lost Civilization, Dreamin' Attraction!!, NULCTRL, VECTOR, Bookmaker, Trap Crow
Eternal Core: Sheriruth, memoryfactory.lzh
Luminous Sky: Ether Strike
Vicious Labyrinth: trappola bewitching, Grievous Lady
Adverse Prelude: Ringed Genesis, BLRINK
Black Fate: Dantalion, #1f1e33, Tempestissimo
Final Verdict: Arcana Eden, Pentiment, Last
Absolute Nihil: ALTER EGO
Absolute Reason: Vicious Heroism, Black Territory, Cyaegha
Ambivalent Vision: Blossoms
Memory Archive: dropdead, BATTLE NO. 1, Megalovania (Camellia remix), Mirzam, Alexandrite, SAIKYO Stronger
World Extend 1: False Embellishment, 1F⎷, Turbocharger, Bamboo
World Extend 2: Dynikitós, FANTA5Y, Kanjou no Matenrou ~Arr. Demetori, RGB
World Extend 3: MORNINGLOOM, Distortion Human
Undertale collab: yes.
WACCA collab: Quon, Meta-Mysteria, GENOCIDER, Stratoliner, Ouvertüre, eden, XTREME, with U
Rotaeno collab: Dual Doom Deathmatch, Vulcānus, MVURBD
Cytus II collab: Bullet Waiting for Me, Lucid Traveler, 99 Glooms

And for the ones I don't have:

Your Voice So...
Feels So Right
Impact
GIMME DA BLOOD
Galaxy Friends
REKKA RESONANCE
Strongholds
UNKNOWN LEVELS
Protoflicker
Oshama Scramble!
Good Bye, Merry-Go-Round.
FLUFFY FLASH
Malicious Mischance
Scarlet Cage
New York Back Raise
Dot to Dot

Favorite songs from Phigros:

dB Doll
Dead Soul
もぺもぺ
modulus
GOODRAGE
Magenta Potion
NO ONE YES MAN
MARENOL

Favorite songs from Dynamix:
Vengeance
Slyness Foxx
OCCHOCO-REST-LESS
Before Sunrise
NightTheater
Daydream
Rocket Lanterns

A/N: This chapter is being edited to reflect my current opinions! Cytus II and Arcaea have been updated, Phigros and Dynamix need to be updated still, and I need to add Rotaeno and Colorful Stage on here.