A thoroughly entertaining bio, and I applaud you use of a more obscure character from the DCU. 100% approved. 

Instead of starting you off on the official Justice League roster I think it would be better to see Ambush Bug trying to prove himself and earn his place in the League. The League members would see him as a bit of a nuisance and an annoyance, but he would eventually earn their respect. Let me know what you think.