You are Mori's daughter, nobody knew till you turned 15 and Mori introduced you. You weren't really experienced with mafia let alone fights, so Mori made Dazai and Chuuya your bodyguards, they were the same as you.

when Mori wasn't around they would make fun of you, calling you "daddy's princess" they weren't really annoyed by you but they couldn't do a lot anymore. They would have to keep an eye on you always.

You would always listen to Chuuya and Dazai arguments, you found it funny. But sometimes felt left out?

Dazai: "You're my dog, Chuuya~"

Chuuya: "HAH?"