While not much of this creature is known, the Strange Elder said that it is a powerful creature that makes for good materials and has strong benefits. It is unknown as to if it's non-raw material is any good, but it is stated that it's raw material is good. It was noted as "Dangerous" by Akame, which must mean that it's class is above class 4, considering that she didn't just call it a "Freak". Hinata stated that "On nights of the full moon, it's best not to go out fishing. They say in Yaenami Village that an Umibouzu who spots the light from your ship will attack.
- It is noted to be a powerful Japanese mythology creature.