You've got a lot of the basics down, at least. :) Eskel will be in season two - he's a fellow witcher, and Geralt's close friend and brother-in-arms, you won't be able to miss him. (That and he's got a really harsh facial scar lol.) The fandom's really excited to see him on-screen.

Oh no! Finn is great to start with. I'm glad to provide some CR that'll hopefully/potentially help him out. Some of Eskel's witcher spells, Signs, are a little similar to Force techniques. (Aard = Force Push for ex.) Finn and Eskel can perhaps find some sort of mirrored common ground.