I guess orange, since im also a big fan of Undertale and orange is bravery, which is technically not his trait, he is more justice, so in between orange and yellow
Shadronia, Peyton, Xander; Hakai? (I could probably also tease Eggy's new character here); Eggy, ove, essy; Pearlfan; Tsar (considering hakai here too); Inkmatas, and maybe data or life. X03? Definitely rizu. Pretty sure her outfit's blue. Collector, Astra, and creatie if there's room