Swamp Thing is a pretty skilled DC fighter and his abilities are very potent. Gon has a high degree of super strength and speed on his side so he won’t be losing this round without a fight. In fact, I would say that Gon wins this round. Swamp Thing won’t be able to break through his nen shields and Gon’s attack power will lead him to victory. Gon wins.
DReager1.com 
This is beyond retarded gon is nothing to swamp thing, and even if he did somehow kill him if there is any plant life swamp thing will continue regenerate and snap gon neck and teabag his mangled corpse. Stop overrating weak anime characters who has no chance in hell to defeat.
I’ll do my best to never overrate anime characters. Either way it’s hard to do that since they are so strong