lively personality, equal parts excitable and irritable by circumstances, altruistic habits cause his emotions to be easily swayed by others, bearing concern and self-sacrificing actions that extend even to those that've caused harm to him,  heavy feelings of guilt. While under ZENO's influence, Maeno is heavily destructive. He becomes sadistic and forces someone to solve deadly puzzles for his entertainment.  Loves dogs, doesn't like cats. 
...Once Maeno got into a fight with a cat.