Charles is currently investing his money in turning the mansion into a school and rebuilding Cerebro and investing in the future of mutants.

Cassian has never had money, he might pretend he does for jobs, that took learning to act like he belongs. If he came into a fortune, probably stolen from the Empire or a crime syndicate it goes right back into the Rebellion. Honestly he's probably stolen small to medium amounts for various cells he's been a part of. That covers everything from travel visas for refugees and informants, bacta, money for ship repairs, weapons and ammo.

Quentin has money and mainly uses it to make sure Toby and their household has food. She never buys enough. He'll also splurge on tech stuff because he's a teenage boy.

William did have an influx of money after his father's death, that was used to buy the land and get Mark to school.

Sameth has never worried about money and really can't buy what he wants which is more understanding of the Charter.

Moist is really good at taking people's fortunes and investing them in nice suits and some small luxuries for himself.

Ivan has a fortune that he doesn't really spend, he lives on his salary with extras for clothing, cars/lightflyers and presents for girlfriends.

Will S. wouldn't know what to do with a fortune, he'd give it to Robin for Nottingham and put some of it into Milliways' funds.

Demeter has a fortune and at the moment is using it to help refugees and small farmers in her area.

Tumnus is part of the royal household and he has his home, he wouldn't know what to do with a lot of extra.