First, thank you for the offer.

1) I think skills check will be partly covered with the PC being warlock or something / warlock which will mean he'll got high charisma. Then, the thief / gloomstalker will cover locks and traps. I think that will cover most if not all skill checks right ?

The goal is to have a team which can destroy anything, be it one target or a horde of enemies. I don't really care if it's a one time per rest or fifty.

2) I only have few mandatory things. First, the PC must be warlock or some sort of warlock because I want a high charisma character to do the talking and I want to try the class. I still need to figure out is exact buil and his race but I know it will be a dark urges origin. The second mandatory would be a thief / gloomstalker for all the locks and trap and I want to see what is an optimized sharpshooter. The character will probably be Astarion until I can swap him out for Minthara : I think drow is better for that role and I wanna see her story. Finally, I think I wanna embark Shadowheart too in order to pick another path at the end of act 2 (namely, using the spear). But I don't have any idea which class she will be - and I have no lore restrictions or anything. I'm not sold on the need for healing if my team is able to blow out anything in two turns but I'm not against it.

3) I guess I don't have any problems if some members of the team spike early and some late. The thing is, I'd like to have a team that feels powerful during the whole playthrough so yeah, maybe not a whole level 12 spike party.

4) I'm not against the occasional respec but maybe not a full respec every level. I mean, if I get a build defining item that means I don't need to pump a stat on my character because the item got me covered, yeah, a respec is cool so I can boost another stat but that's really the kind of things that I'd see myself respecing a character for.