Water Hose

Water Hose (ウォーターホース) were pro heroes and Kota's parents.

History
At some point before the start of the series, both members of Water Hose were defending a village from Muscular and sacrificed themselves to save the civilians. The Water Hose duo managed to injure Muscular enough to drive him away, including deeply scarring Muscular's left eye, and thus saved the civilians.