if you want a Tav that isn't a blank slate, go with Dark Urge background; it is edgy but the story is interwoven with the rest of the game's narrative vs a normal default Tav just kinda standing there smiling.

Pick whatever race/class combo seems cool; Wizards have access to a lot of different types of magic so they come with a high level of complexity, but other classes like Way of Shadows Monk can be OP as shit if you abuse stealth and teleport mechanics.

Dialog is a bit more impactful so make sure you're saying what you wanna say because you might not be able to take it back. There are a lot of ways through the plot.

But yeah pretty much just do what clayh said.