I used to watch this cartoon  when I was very little. I can't remember much but I'll write down whatever I remember in hopes of someone recognizing the title.

 - The protagonist was a semi-stickfigure man, completely in white.
 - He had a girlfriend/fiance/wife, who's name was M or Maria who had an M shaped body.
 - The setting and story was overall very dark and mature for a cartoon (at least as much as I remember) with themes such as nuclear apocalypse, loss of loved ones etc.
 - The language was English.
 - I am not sure of the country of origin.
 - I remember a radioactive apocalypse in which the protagonist (who might be a scientist/vigilante) seek shelter in an underground bomb shelter.
 - I remember giant red ants inhabited the surface after the event.
 - A supercomputer type character kidnapped/murdered(?) the protagonist's girlfriend. 


I'd love to be able to watch this show again! Please respond if you got a clue!