It's not a mask.... he's just messed up.... but it's a part of who he is.... it's just that, because of the attitude, people don't take him seriously...I'm pretty sure the bad boy personality is just the mask he is wearing. His true emotion is when he threaten Zenkichi's mom when he was 4 and when he seriously fought against Medaka.
⨽Thanks you verry much!!! I only have interest in kumagawa kun the other are all garbage hhehehh⨼The order for the full Good Loser Kumagawa story is:
1) Read chapter 124.5
2) Watch Ep. 12 of Medaka Box Abnormal
3) Read the two Kumagawa novels: good loser kumagawa volume one: suisou is full of wriggling brains and good loser kumagawa volume two: the zugzwang of suisou management (at polaristranslations)
4) Read chapter 192.5