Harry Potter

Harry Potter was Nik-Nak Man's bully at school. He is also probably related to Rohan Potter.

A Place for Superheroes in Training
Harry Potter was Nik-Nak Man's school bully. He then went to A Place for Superheroes in Training where he found Nik-Nak Man again. However Nik-Nak Man beat him up with his new abilities.