The absolute characters who are extremely funny and very comical. Funny characters are silly and sometimes harmless but many of them are pretty dangerous despite this such as Bender (who acts silly and crazy intentionally to make sure others misjudge him), The Joker ( who despite being a clown with many zingers he is extremely dangerous and sociopathic.) and Mabel Pines who is absolutely silly and hyper but she when she is angry she can get psycho and can pulverzaite others should they push her buttons.
Sometimes these characters are not really that smart. But that's okay because stupid people can be funny!