What's your favorite OP build?

For my first run, I focused largely on engaging the roleplay elements and didn't worry too much about optimization.

For my tactician run, I'm attempting to utilize about as much OP shenanigans in my party as possible, and I'm having a great time with it so far. What are your favorite OP builds to actually play?

Bonus points if they're viable all the way through the game without respec-ing.