The short answer is a lot. However, I think the official number is 22.
The twelve here, a canon Dovahkiin, a dragon priestess, five on SolstheimBound, and three for Dragon Age.
Doesn’t help I’m constantly getting ideas for more that I have to keep beating back with sticks
y’know essentially. I’ve almost made a bard/assassin from the royal court at Wayrest (who would be my canon Listener), a blind Argonian witch, an Imerial Thief from a previous play-through (who would be my canon Guild Master), a cartoonishly manly Stormcloak who uses the Rueful Axe, and an Altmer cannibal who uses illusion magic has the life goal of stealing all the cheese in Skyrim (and I would make her Dovahkiin for shits and giggles).
So really, I have a problem and I need someone to hit me with a large book each time I get a new idea.