@AlternateMan: I like the character concept, though maybe we could make some tweaks. I feel that the 'Decontamination Pad' is a bit too similar to Soldier's. Since he's meant to be an assault offensive, he still would need some sustain. I propose that you use something that fits with his character theme. Perhaps he has a nerve gas that can debuff or slow enemies, and can give Quarantine a small spike heal. 

This could allow for escapes (for both you and the team) and can serve to heal you so you can stay in the fight (even if you might need to step back). With that being said, he does feel a bit more like a defensive character. You could even use his Disruption Bomb as a powerful variant of Hanzo's 'Sonic Arrow'. Plus with the proposed move, he'd have area denial and since he has a larger health pool- he could more reliably defend an objective. He'd be one of those pesky characters that the rest of the team struggles to take down in an objective (See: Mei, Lucio, and Tracer) from how you describe his weapon and his abilities. 

Though these are just some suggestions, feel free to let me know what you think. Either through here or in a PM. Thank you for your interest, and I really enjoy your character concept. 

Edit: Also please don't think that these are the exact tweaks you have to make. These are just some ideas I had based on your concept, and how it reads for me in-game. If you have more ideas or anything like that, like I said, let me know. :)