A married pair of Pro Heroes and the parents of Kota Izumi, remembered in My Hero Academia for a single act: dying together so a village full of civilians could live. The praise heaped on that sacrifice is exactly what turned their son against heroes.
Water Hose was a two-person Pro Hero team, a husband and wife who were also the parents of Kota Izumi. Both of them wielded water-based Quirks, and both are dead. They first appear in the story only in flashback, well after the events that killed them.
Kota was three years old when the pair defended a village from Muscular, a villain classified A-rank. They held long enough for the civilians to get clear and were killed doing it, though not before wounding him badly: Muscular lost his left eye to them and carried a deep scar afterward.
Everyone around Kota treated the deaths as something noble, and the constant praise is precisely what damaged him. Losing both parents at once to hero work left the boy scarred rather than proud, and that resentment shapes him for years afterward.
The team's two members are identified only as Kota's mother and Kota's father; no personal names are recorded for either, and neither holds a hero name separate from Water Hose. What is known of their power is the water element they shared and the proof of its strength: between them they inflicted serious, permanent injury on an A-rank opponent of considerable strength before falling.

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Water Hose is the name of a two person Pro Hero team made up of a married couple who were also the parents of Kota Izumi. Both members wielded water based Quirks and died defending a village from the villain Muscular, appearing in the story only through flashback.
Water Hose died defending a village from the A-rank villain Muscular when their son Kota was three years old. The couple held Muscular off long enough for civilians to escape, wounding him badly and costing him his left eye before they were killed.
Water Hose's two members both used water based Quirks, though neither ability nor either hero's personal name is recorded beyond the team name. Together they proved strong enough to inflict a serious, permanent injury on the A-rank villain Muscular.
Kota Izumi lost both parents at once when Water Hose died fighting Muscular, and the constant praise heaped on their sacrifice as heroic left him scarred rather than proud. That resentment is what turned Kota against heroes for years afterward.
Water Hose debuted in Chapter 74 of the manga and Episode 41 of the anime, appearing only in flashback well after the events that killed them. The team is also known by the Japanese name Wota Hosu.
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