Separating the game into two versions is not a bad idea. The game will already take place on two different planets and routes, depending on who we choose between Dilbert and Blanca, so having a version for each is a good idea. And the focus may be on the character in the version currently in development.
already about having little about Blanca, I see the character as someone chaotic clumsy imposition and inappropriate haha, so I think it would be cool if her story highlighted these characteristics could put them in embarrassing situations because of this personality Blanca, she is also very strong, this can be a characteristic of her race, so her planet can be a dangerous place full of monsters, for Blanca this is a simple trip for Mavis and Palter, this is dangerous, very dangerous, the Palter in this scenario would be there to keep Blanca in control of her chaotic and unpredictable personality, Palter could also keep Mavis safe from Blanca and the planet.
I hope this little example helps you get some ideas about Blanca.
I love your art ❤