Of the kaiju I considered “borrowing” for King Roach the Gargantuas are the only ones I thought of a King Roach specific story for. In their movie they were brothers (sort of). One was brown and “good” (he just hung out in the forest by himself) and the other was green and “bad” (he came to the city and ate people).

This is the good brother. If he were in color he would be brown.