My version of Ash is a little more aware of the type chart--he would not ask Pikachu to use Thunderbolt on a Ground or Rock type.
Each of the gang are talented musicians and performers, and have hobbies besides Pokemon.
Laughs.
I've read your character studys and outlines... Let's not be humble here.
The cast consists of musical prodegies/virtuoso's across the board, which makes for a fascinating worldbuilding angle you dont see very often in fanfic...
Personally since Giovanni tends to be my standby canon character, and the roost/transversal (r/t) variants the one posted on this site...
my headcanons for r/t'verse Gio are tied to his culture.
He's deeply entrenched in the social norms of his people even if he conversly starts bucking against them as part of his rebelion and growing up pains.
gio having mastered a poker face to keep his head on his shoulders then upping his game to master total body language masking leans
heavily on language cues... His pulse and posture will never rat him out but he's his most honest when speaking italian, be it terms of affection or threats, and he hasnt been able to slap a clamo on that tell despite trying for years...
The other headcanons i have tie into the trauma and how its handled. and that tangle is called the "silver and green psy notes" on my drive. It's a long, wip, link encrusted, coagulation of data thats my goto when the kids get stuck narriating.