Giving Kong Emperor a sister is also a big golden finger. Although this golden finger will only hinder Kong Emperor every time, the sister is absolutely devoted to Kong Emperor, regardless of the reason, right or wrong.
Well, also, my sister has incredible abilities, but she can't use them. In order for her not to be evil, there are many, many restrictions on her -_-||
Just make it clear that my sister exists for the sake of Emperor Kong.