Emusa
Emusa is an alien animal in the Zone portion of the Generation 1 continuity.
Emusa (e-mu-sa, エムサ) is a small extraterrestrial animal that resembles a pink raccoon-tailed rabbit with small wings. Despite their size in proportion to his (?) body, these wings allow Emusa to fly. He is also capable of speech, and talks in the third person.
He acts as a pet to the humanoid alien Kain. His species may (or may not) have been native to Kain's planet of Feminia; if it was native, then its status following Feminia's obliteration doesn't look good.
He is sometimes referred to as the "Zone Bunny" by the Transformers fandom.
Animated continuity
Voice Actress: Yumi Tôma
Emusa was present with Kain when planet Feminia was attacked by the Demon-Generals Abominus, Overlord, and Menasor. The pair were in grave danger, but were saved by Victory Saber, which allowed them to reach Galaxy Shuttle in time to evacuate the planet. Victory Saber was not quite as fortunate - he was caught in the blast of Feminia's destruction, which Emusa and Kain witnessed from space.
Presumably having no where else to go, Emusa and Kain went to live on planet Z ("Zone"), a machine-world populated primarily by Micro Transformers. This caused Emusa much aggravation; he complained that, as a living creature, he wanted to be around flowers and nature, not metal. Countdown then pointed out that Transformers were living creatures, too.
Zone Manga
The single Zone manga story was a retelling of the OAV episode.
(Note: Emusa's design was altered for the manga, and his ability to speak is in question. He still appeared to be sentient, however, as he had a thought balloon.)

