It changes to serious very fast. When it gets serious, but can be joking and fun at times, mc craves adventure... and finds the bright side of every situation he finds himself in.
Though he does get mad at times, and sad.
Mc is like a Vegeta in a way with his stamina. As he can outlast most of his opponents who is beating him up in a fight.
He is always ready to meet the next challenge. Even if its bigger then he is.
He never backs down from an adventure no matter how scary it is, unless he truely doesnt care about it he wont back down.
I guess you can say he is an...adventure maniac...the stuff that fears others doesnt necessarily fear others.
When it comes to fighting He might kill himself just to defeat an opponent, he had come close to death before...