4-6 years ago I read several comics books about a space adventurer (I don't remember what he was really doing, I think it was in exile) with retro-looking suit and guns (50s style). He has a square jaw, black short hair and always smokes a cigar.
The only elements specifics elements I remember are spoilers, in the arc about the past of the hero :
When we learn the past of the hero, we see that he was a farmer when two aliens race (green blobs on one side versus robots on the other) choose to use the earth as a battlefield, exterminating the human race in the meantime.
This arc end with :
To avenge the human race, he send a bomb on the homeworld of one of the alien races (the green blobs).
Thank you in advance.