Hmm....I promised to train Xeno to become stronger but his only reason to become stronger is so that he is more suitable for CS. Basic physical elements to become stronger are:
1) Stamina
2) Strength
3) Speed

Regarding appearance:
1) Do not slouch---If he slouch, there's still ways to look him stronger.
2) He needs to straighten his neck to full straight instead of going forward.
3) I am still thinking of how he should change his hairstyles.

Regarding mentality, maybe it's better for him to be:
1) Individual a.k.a. SOLO.
2) Trust himself only.
3) Less caring.
4) Not vulnerable when encountering females.
5) When someone piss him off, he should not just walk off, he should confront that person.
6) Can't seem to break the solid limit, so I guess there's nothing I can do about it---this limits me whereby I cannot use vulgarities or substitute vulgarities.