Koala

Koala is a Chimera Ant.

Appearance
Koala looks like a small bipedal koala with fluffy round ears, big round nose and wears a black tuxedo with a pair of shoes.

Background
Not much is known about Koala outside of the fact that during his previous life he was a hitman. This prompted him to continue his cycle of existence when he was reincarnated into a Chimera Ant.

Chimera Ant arc
Koala was a soldier under Meleoron's command, but disapproved of Meleoron's pacifist attitude. He generally does not take part in the war between the Hunters and Chimera Ants. After Meleoron has gone individual, he is presumably free from any duty.

13th Hunter Chairman Election arc
He is last seen talking with Kite after the chairman election as she resembles very much the girl he killed when he is still under Meleoron. It is revealed that he kills the girl not due to bloodthirst but to save her from further torture by his fellow Chimera Ants. He is ordered by Kite to join his expedition troop and protect her as a way to compensate for what he has done as a human and a Chimera Ant.