Eel

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Eel (ウナギ) was the Quirk used by Teruo Unagisawa.

Description
Eel allows the user to transform into an medium sized Eel, but under the effects of Trigger, this Quirk transformed Teruo into a large, eel-like creature with incredibly slimy skin. This slime serves as protection since the physical blows against him slides off without hurting him.

After undergoing experiments at the hands of the Villain Factory, this Quirk evolved into Electric Eel.

Weaknesses
If Teruo's body is covered with any substance that can drain the moisture from his slime, like flour, the Quirk loses its protective ability and makes Teruo vulnerable to physical blows.