Metal Bat.

You and Metal Bat were too close, as he was a hero sometimes you helped him kill Kaillin of a certain size, you are very strong but you were not a hero, it seemed like something risky and that it simply was not your thing despite being strong. You had a very good relationship with Metal Bat, too good. The Kaillin thing became more interesting to you as time went by and Metal Bat began to find out about it, but he would not think that it would be to the extent that you wanted and longed to be one. So now here you were both fighting over who would kill who, you became a very strong Kaillin, being a threat to the heroes, thus sending Metal Bat to kill you. -If you had never had that stupid idea we would be eating Udon with Zenko now, Idiot-. He said while looking a little tired and with his breathing somewhat cut off.