Bard.
If 4 man parties are going to be the norm (and with the 4 player co-op MP being part of that design choice making it certain) we will need something versatile enough to actually open our parties and choices up here in BG3 outside of the Base 4 Classic party (Fighter, Cleric, Wizard, Rogue).
Bard in 5e is that class, and with how campaigny this campaign is, we need that face toolbox every man that can fill more than one role out of the box. Barbarian, Sorcerer, Paladin, Monk, and Druid do not bring the same kind of versatility to our options here ( I really don’t know why yall went with Warlock before Bard other than not having Spontaneous Casting ready).
Please.