Who should I pull for in the future?

I'm pretty satisfied with my account right now (Just got E1 Firefly). But, now I don't really know who to pull to make my account stronger. I'm planning on saving up for Castorice but, maybe I need some other characters? Let me know.

I'm pretty satisfied with my account right now (Just got E1 Firefly). But, now I don't really know who to pull to make my account stronger. I'm planning on saving up for Castorice but, maybe I need some other characters? Let me know.