Gremlins

Gremelins, also called ri-komo for a time by Team Haruhiro and the Tokkis, are strange bats-like who look somewhat like a mix between a Goblin and a Bat.

They were first identified by Lala and Nono who kept their existence a secret until Team Haruhiro and the Tokkies discovered them in the Wonder Hole and made it public, at which point they dropped the pretense and even managed to make their name the "official" one instead of the name chosen by Kikkawa: "ri-komo".

They're regularly found near passage to other worlds.

Biology
Gremlins have a build similar to goblins, at least close enough for Haruhiro to first think they were goblins. but in fact mostly look like bats, their body and head especially. Despite looking like Bats, they laid eggs and, according to Lala, reproduce fairly fast.

Gremlins are surprisingly weak creatures considering they can be found in dangerous places like the Wonder Hole, as such they can't really fight back and usually won't attack either. Probably for that reason they seem to always live in large groups, living together in a nest and stocking all their eggs in one of the chambers.

It unclear if Gremlins are sentients as they live like animals but while it doesn't seem anyone successfully communicated with them, the way the first one Team Haruhiro encounter acted makes it seem like it could be possible.

Finally, and most remarkably, Gremlins are regularly found near passages to other worlds, a fact that leads Lala to theorize that:


 * 1) Gremlins could have the power to cross between worlds.
 * 2) A way to sense seams between worlds.
 * 3) Or just have a tendency to find and live near such passages.

Location
Gremlins seem to only live near passages between worlds, Lala theorizing that they may have a way to found or create them which they use to flee from predators.

As such Gremlins have been found near most known passages between worlds:


 * In the Wonder Hole, near the passage to both the Dusk Realm and the Dark Realm
 * In a passage between the Dusk Realm and Darunggar

However, for some unknown reasons, they weren't found in the passage between Darunggar and Grimgar near the Fire Dragon's Volcano.

Neither are they found near any of the passages link to Parano, likely because all of those are either unstable (the white fog) or artificial (the 2 doors). Moreover, Parano strange and dangerous nature makes it a poor choice of place to flee into.

Trivia

 * The name "Ri-komo" is an inversion of "Koumori" (蝙蝠) which means bat in Japanese.