Kiwi is the person in the costume, while Josh acts as the speaker. Despite his small stature, Josh is meant to have a rather deep voice. When combined with Kiwi, who is much larger than Josh and more physically capable, they act together as Moonie. The Moonie persona was originally held by Josh's mentor figure, "Moonman."
@JJILLION I was skeptical about you representing Null's split personality through two different characters that live together in the same house, but it's actually working really well so far in your comic. Did you consider representing Null by a single character? What made you split him up into the "green guy" and the dog, as two separate characters?