My tav is fighter, companions are:

• Astarion: best for lockpicks/stealthy stuff, he's a killing machine with the dual xbow rogue/ranger build from cRPG Bro
• Shadowhear: full cleric, quite resilient, she has some amazing abilities like spirit guardians (she can just dash around and one-shot groups of low health mobs lol), spirit weapon (useful to keep some enemies occupied because they attack the weapon and not the party) and a big heal for oh-shit moments - for builds I'm currently using the tempest one by NizarGG but I'm thinking of making my own to enhance the abilities of her I want to use
• 4th spot I use for the companion that makes the more sense to me to bring depending on areas/quests, so I'm basically switching almost all the time

I'm pretty satisfied with this setup tho I'm probably missing stuff on the 4th slot so next playthrough I'll use the no party limit mod to see how good or bad my "instinct" is XD