Agree that you only need one poll for it. The secondary characters can just hope people are generous about their votes
. One question I guess if we want to keep the poll anime only. If so I'd suggest:
Horo
Lawrence
Nora
Enik
Chloe
Marlheit
Jacob
Weiss
Zelen
Now if you want to add some characters from Volume 3 then you could add Mark, Amati, Deanna. But since not everyone is reading the translation expect they'd be saved for later if we get a second season.