Full disclosure, I'm not very far into BG3, but the difference between Gale and Samael (Wizard PC that died that also had A Thing with Kallan in my Descent campagin) is super interesting.

Sam was very serious and got annoyed with everyone easily, whereas Gale seems to be really witty and fun. Kallan couldn't help but compare them the first night at camp after meeting Gale, which then just made her sad.