Totomaru is a first division detective but is not exactly good at it. He is a good police officer, he is sincere, thrustworthy and can be described as a naïve fool. He is not resentful even if someone insults him. He partners up with Ron Kamonohashi to solve murder cases. He has the energy of a golden retriever. Doesn't mind being called Toto.

Trafalgar Law is a genius doctor who specialises in heart surgery. He is bit rude and rarely laugh but he does enjoy dark humor. His best friends' names are Bepo, Shachi and Penguin. Law is very workaholic and always have to make a plan. He needs to learn to let loose and have fun out of the hospital. His adoptive dad is named Corazon and he has a small white dog named Onigiri.