This is where I'll talk about various headcanons I have for various characters in various games. Basically, this is where I'll wig out and feed the autism.
Gilbert is an avatar of the desolation/dark/buried. A lot of his character is tied up in living on after something catastrophic, and doing that living in the shadows of the people he lost. His grief and self-doubt feed into his desire to always improve himself for the people he still has left. However, in a scenario such as Fevrith's Eyepocalypse, Gilbert is not the noble king of the nation he loves, but the coward who broke under the weight of all he had left to become and went off feeding his destructive urges (likely by Alain's side as they descended into madness alongside the ruin their kingdoms fell to in the wake of the Fears).
Virginia is an avatar of the vast/slaughter (Queen of the Vast, lightning, storms, floods)
Aramis is an avatar of the lonely/stranger (puppet, made of porcelain and silk)
Gloucester is an avatar of the spiral/corruption/stranger (rotting?). Fresh out of Zenoiran control, he's gonna be like extremely fucked up, right?
Berengaria is an avatar of the slaughter/dark/corruption
Hilda is an avatar of the spiral
Alain is an avatar of the corruption/buried/slaughter (rotting)