>>48731510Two main reasons:
1). Hololive management breathing down everybody's necks.
2). They're not as familiar with each other and so it's always nerves and not wanting to be cringe.
Look at the difference between Mouse+Cali 1 and Mouse+Cali 2 or if you want something just VShojo Lewdcast with Nyan 1 and Lewdcast with Nyan 2. These girls are all spergs and until they get to know each other and can feel relaxed it's always just a compliment fest, self deprecation, and general reluctance to really banter. That's why Kiara+Nyan was weird. Nyan was doing exactly what I said above but Kiara decided to be a bit more of herself.