Here's the girls :3 I was thinking the names Mantis and Viper, and giving them quirks based on their names ^^ like Mantis can turn invisible and has extra strength and enhanced sight. And Viper has snake fangs and potent venom, but is mostly blind aside from seeing heat signatures like a pit viper
:3 Mantis is the platinum blonde, Viper is the normal blonde
Here's the fatherA man named Sugimoto Motagura. He's not really a great person, and works for a drug business. He doesn't have an astounding quirk, just one that lets him see far.
The twins get their quirks from Kass' birth parents, some blood tests showing animal based quirk Genes were passed through Kass and not the father