| Ark-type Nightmare | |
|---|---|
 Light Blue type | |
| First appearance | Keroro Gunso the Super Movie 2: The Deep Sea Princess de arimasu! |
| Profile | |
| Species / Type | Alien |
| Occupation | To help Meru and Natsumi. |
This is one of Meru's royal minions. There are four of them in his army.
According to Maru, Ark-type Nightmare was summoned using the Mare ball.
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