None of them are my noms (I was asking in advance of nominating*), but of the ones currently in the combined tag, the following are definitely composed entirely of characters only appearing in KotOR II:

Group: Atris/Kreia/Female Jedi Exile (Star Wars Legends: Knights of the Old Republic)
Group: Atton "Jaq" Rand & Kreia (Star Wars Legends: Knights of the Old Republic)
Group: Atton "Jaq" Rand/Bao-Dur (Star Wars) (Star Wars Legends: Knights of the Old Republic)
Kreia (Star Wars) (Star Wars Legends: Knights of the Old Republic)

while these are from KotOR I:

group: Male Revan & HK-47
group: Male Revan/Canderous Ordo

(Canderous Ordo in fact appears in II as well, but he's not called that there)

and these tags combine characters from both:

Group: Atton "Jaq" Rand/Revan (Star Wars Legends: Knights of the Old Republic)
Group: The Jedi Exile & Alek | Darth Malak & Revan (Star Wars Legends: Knights of the Old Republic)

*Would it help if when I do add my noms I use a non-canonical tag for the first game?