IM GOING TO KMS I WROTE UP TO 5 AND THEN IT DELETED FUUUUUUCK
Ok fine
1) he is lusamines little brother. Indisputable to me it explains so much especially about g7
2) he transed his gender / sex at a young age and got cut off off of family funding which led him to
3) denying ghetsis's proposal to join Team Plasma multiple times until the mention of Kyurem, the DNA splicers, and colress's desperate need for funding
4) ghetsis sees him as his perfect son/ successor that laika / n / anthea & concordia etc couldn't be, hence why he was fine making colress the acting leader of plasma and trusts him so willingly
5) mostly everything else i think has canon evidence to back it up so... idk. Sweet tooth. Cute. He likes upbeat music and would fw nightcore. He loves substances but even the mangaka drew something to back that one up