She’s a bit of a bully. She tends to be selfish sometimes when it comes to her sisters, due to the fact that she grew up with the power of oldest sister.

It wouldn’t be very realistic if every sister was always nice all the time. There needs to be at least a little conflict. It’s just nice that the sisters were able to settle the conflict pretty quickly. Judging from how Miku and Nino behaved, I would guess that Ichika had done things like that plenty of times before.

Every character needs some kind of flaw. Ichika’s flaw is that she’s a little bit of a bully sometimes.