Nagare Jabashiri is a hot-headed and belligerent supporting character with a profound love for fights and a notably competitive spirit. This drive for competition frequently surfaces in his attempts to prove his superiority over Arajin Tomoshibi. A central motivation for Nagare is his firm belief that he deserves to be the next leader of the Siguma Squad after its current leader, Jin Marito. In appearance, he has spiky hair and is typically seen wearing either a gakuran or a jumpsuit. One analysis suggests an ENFJ personality type, indicating he is charismatic, sociable, and empathetic, often assuming a natural leadership role to inspire and motivate others toward a common goal, with a strong sense of intuition and a deep desire to help those around him. An alternative assessment describes him as an ESTJ, correlating with a no-nonsense demeanor and resistance. Within the narrative, his role involves participating in the delinquent politics that dominate the high school setting as a member of the Siguma Squad gang.