Natsu is one of Arceusrules98's dogs on Floralpikmin99's server, and is one of the names switching between dogs. The official Natsu will have a pink collar. The name Natsu is inspired by Fairy Tail, where the main character is called Natsu and has pink hair. Natsu is companions with Haru and Luffy, Arceus' other two dogs. When Arceus was going to get his horses on Horse Outpost in season 2, he accidentally hit both, and the dogs killed them.

In Prometheus Swamp, they made new leads and managed to get one horse, Creature, home to Pandora Swamp, though it almost died by falling countless times.