Blanc/White Heart = Ex-aid/Emu Hojo most emotional and are based on family friendly games (nintendo)

Neptune/Purple Heart = Lazer/Kiriya Kujo because both of their main games focuses on speed and Kiriya has a similar trolling attitude to Neptune (Sega)

Noire/Black Heart = Brave/ Hiiro Kagami similar tsundere attitude plus both are swordsman (playstation)

Vert/Green Heart = Snipe/Taiga Hanaya uhh… both main games are shooter games?(XBOX)

(honestly why doesn't vert have a gun Xbox games are mostly shooters not RPG's)

these are the rider to CPU pairs that make the most sense to me

(Don't hate me for not matching up the protagonists)