Wow, uhhhhh~ after reviewing all the information I presented on Elio thus far (revised stuff included), realistically speaking, Elio would inevitably become Johan Liebert from Monster with a small mix of both Hao Asakura from Shaman King and Sōsuke Aizen from Bleach - albeit with the absence of arrogance in the face of obtaining a greater power that fits in accordance to his plans; he typically follows the phrase: "If you want something done right, you do it yourself" - sometimes religiously.

As cliché as it sounds, Elio wishes to bond with Arceus and the Unknown collective so he can link himself with all beings across multiple planes of reality; in this sense, he can interfere with the free will of others at his whim while being provided with answers that were once lost to him for one reason or another.

Avian either gives up and becomes another identity-less cog in the machine or takes matters into his own hands. Someone who sees incompetence and cruelty and takes the quickest and most direct route to 'fix' it. Calyrex causing trouble in the Crown Tundra? His now. Macro Cosmos acting up? Somehow he's standing behind the chair of the new president. The man behind the man who knows what is best and will help you whether you like it or not.

Stahl is already a villain with a saviour complex and a fixation on Eternatus.

Arryn becomes a Movie Villain/Hunter (Iron Mask, J etc) where she shows up to steal legendaries and keep them for herself regardless of the concequences.