Ack sorry I kept meaning to resond to this and forgetting.
The bugs illustrated in the book don't have any perticular characters to them, but I do like to use them as refrences when making new NPCs for games. Those ideas might make it into another adventure module one day, but that still won't be their 'official characterization' or anything. All the art is for player insperation, and I love to hear the stories you imagine for them.