Just as the same with the prequel, Snezhinka: Sentinel Girls 2 also have exclusive character pairing in challenge mode that plays special cutscenes and offers some stat boosts.
Pairing
Snezhinka & Dochka
Should still only be available while playing as Snezhinka since we can’t pick her as a partner, unfortunately.
Anita & Dezik
Bug.
Hector & Lisichka
They’re so cuteeeeeeeeeeeeee in the cutscene.
Krasavka & Abrek
I could see these two fated to be together from miles away.