[quote=MrDidact]
Dingo, A good sheet for the most part but the main issues are with powers.
[/quote]

While he would be immune to punches and bullets (which wouldn't really be too different from intangibility or superhuman durability), the majority of attacks could still have an affect on him. He would still be susceptible to magic, the entirety of his swarm could be contained within a magical or meta-human generated bubble, explosions would be fatal, sonic attacks would still affect him/disorient him, concussive blasts would 'squash' whole swathes of his swarm, a speedster that ran 'through' him at sufficient speed would have the same effect as a swarm of bugs meeting a windshield, etc. He would still have many, many weaknesses, he would just be immune to melee attacks and (most) weaponry. While he is immune to swords, he is perhaps the only hero that would give a villain with a fly swatter a second thought. It would also take enemies a short amount of time to learn of his abilities and his weaknesses by extension. Even if they didn't jump to the conclusion that he was a swarm of insects, the would still notice his immunity to melee and resort to other attacks quite quickly, which is why he relies on fear, to prevent people from touching him long enough to identify his weaknesses.
The 'chameleonic' part of his insects is from information I gathered about the insect world, with insects mimicking leaves, sticks, etc. By and large he his just an organized swarm, but instead of someone who could summon as many insects which would have the same immunities, yet also carry numerous poisons or abilities, he is restricted to controlling only [i]his[/i] swarm.

His fascination with insects could be explained due to his upbringing, with his favorite novel idea being Michael Chricton's 'Prey' and his favorite horror entity being Lovecraft's Shoggoth. This was more of a middle-ground compromise I was trying to reach, allowing him to be formless (taking on horrific visages from his minds eye without always needing to use his toxin) and insanity inducing like a Shoggoth without granting him its' "Survive-the-arctic-cold-for-aeons-because-it-took-a-nap, cannot-be-killed-only-sealed-away" invulnerability.