You have two options right now for a second team.
1. Get Rappa and make a super break team with HMC. Rappa is basically Erudition Firefly right now according to leaks and it's a very strong team considering how Superbreak stacks
2. Get Black Swan and Robin for a DoT team. You already have...
It's interesting that they went for a V-Tuber that practices Taoism, considering that it kinda have opposing views wit confucianism, hopefully they also tackle western philosophy, if we're lucky we'll see Nietzsche as a femboy