Why not make it even instead of lopsided? Maybe they "save" each other in their own unique way? I'm not too familiar with this trope, but sounds like two people of opposite personalities can help each other grow. If he is self-sufficient but a bit boring, and she bright and bubbly but feeble and needy, maybe they strike up a relationship when he gives her advice on how to be more self-sufficient, and she gives him advice on how to have fun by opening up to people and being more social.
I could see several episodes where situations arise that challenge each of the character's normal tendencies, then they go to the other for advice and try it out, and it doesn't turn out so bad. Or maybe for comedic effect it turns out ridiculously bad. But either way they come back to each other and their relationship grows deeper after every challenge.
Just my opinion. In my experience, I've appreciated most how much I've grown after knowing someone in that deeper way.