
Quick answer — Jin Kobayashi worked on School Rumble 2nd Term (Original Creator), School Rumble (Original Creator), School Rumble OVA (Original Creator) and 2 more anime.
Jin Kobayashi worked on School Rumble 2nd Term (Original Creator), School Rumble (Original Creator), School Rumble OVA (Original Creator), Natsu no Arashi! (Original Creator), School Rumble Third Term (Original Creator).