Rivalries
Ema Skye (Akane)
People say that Klavier and Ema love each other. Which is not true, they just work together, since Ema is a detective and only prosecutors get assigned detectives. During turnabout 3, Klavier did say something along the line that he wanted to see Ema, but that is just a cover up. He does not want everyone to know that he's scared that something bad is going to happen. Since; his bike won't work, lost his keys, and guitar got on fire. He has an image to keep and he does not want to lose it. Yes, Ema hates Klavier a whole lot, that is not enough reason to say she likes him. No matter how much you look at it, Klavier and Apollo's relationship is more than just prosecuting cases. I am aware that there's a offical art of Klavier stealing Ema's snakoos, but that it just for comedy relief, becuase Klavier is a teasing person. Since Ema was not the one who changed Klavier, Apollo was the one who changed him.
Trucy
Trucy does admire Klavier songs and his guitar playing, but that's all she likes about him and she is Apollo's little sister.
Kristoph Gavin
Klavier's older brother. I can't really say much about him or else I'll spoil everything. But he and Klavier has a very vivid relationship. It's still not sure if they really cared for each other or hated each other.
Other people whom Apollo defend/ helped
Is it not his job to defend people? He is a defense attorney after all? Yet, people will always make it such a big deal. I don't understand. There is no relationship between Apollo and his clients he helps them because he has too, also because he cares for every single one of them. That's why he's always determined to win a case, this is also the reason why Klavier changed.