Welcome back! I don't know if you remember me or my characters, but I'm Vicki and I have three (used to have four but whoops killed one of them~)
Sky is the most relevant here since same guild, a thief aspiring to be a ninja with Audrey as his mentor, etc. Peony's youngest brother!
Merri idk depends on other connections Bel makes I guess. MG, red mage, councilor, naive and friendly etc. They have a kind of similar personality so I imagine they'd get along well if they knew each other!
Kiernan Possibly knows his brothers because of Fighters Guild, etc. Otherwise no idea. ;;;;;;;;