He projects a "fearsome" appearance so that he will not be bullied again. Additionally, Gaku's delinquent personality is merely an important façade, as he would only let his guard down when he knows that the area he is in is where a peer from his school won't see him. The lower the possibility, the more relaxed and casual he becomes. He's the 3rd most aggressive member of the delinquents. Additionally, in a spectrum from most rational to most emotional, among the delinquents, Gaku is the middle ground between rational and emotional, as well as the middle ground between most introverted and extroverted delinquent.
Standoffish, cusses, has his guard up
He wants to seem and remain strong as to not get bullied again
