This overgrown Walein works for Queen Fyora and was loaned to the new mayor of New Faerieland to help her travel to and from the surface of Neopia. It grew to such a large size after an accident with the Petpet Lab Ray.
The player can name the Walein whatever they wish. It is unknown if they have a canon name. It appears that alternate reality version of the Walein exist in the Rainbow Book realm, where they more closely resemble earth Whales.
The player can also recolour the Walein, so it may look a different colour: