Originally Posted by Leucrotta
Datamining, Larian's statements. All companions are going to be origins characters, and there are only eight origins characters. Aside from the five we have, there's
Minsc, Helia, and Karlach
. Which itself is deceptively large, because unless Larian changes their plans, we'll be losing a minimum of five of them at the end of Act I ala DOS2.

Depressing if this turns out to be true but not really surprising at all, given that every interaction is cinematic. A poor, poor decision to insist on Origins characters only and a pitiful number of companions at that.