Bamster

The Bamster (バムスター), also known as the "Colossal Neighbor," is a Trion Soldier made for capturing. They are specifically created for Trion gland extraction. This is the Trion Soldier that comes into the civilians of Mikado City's minds when they hear the word "Neighbor." They are the size of a multiple-story building, and have tough skin, but are not very strong overall.

Appearance
This Trion soldier is one of the tallest shown in the series even including the Fugitive arc and it looks similar to the Bander as they are both quadruped, with white scales and has rabbit like ears however the bamster has what seems to be a shorter neck.

Introduction Arc
The Bamster was first shown to be attacking Osamu after breaking into the forbidden zone but he was saved by Jin.

However chronology, The Bamster was first shown to be raiding Mikado, the tried to fend them off but failed however Border came and repealed all the "Neighbors".

The next time we see one was when the 3 Idiots bullied Osamu Mikumo and tried to attack Yūma Kuga but after Yūma blocked their attack, a gate opens with a bamster coming out.

Large-Scale Invasion Arc
Bamsters similar to Banders were shown to be hiding Rabbits inside themselves.

Trivia

 * This was the first trion soldier we have seen