Who would win in a fight, Luigi or Thanos?
I mean...I love my boy Thanos. But I know that Loogi takes the cake. There are several different Luigis (by which I mean two) to consider.
Luigi. The dude has several lives, the best moustache, higher jumps, and he's packing. Also, he's in it tight with Toad & Co., who are secretly the Illuminati(how else do you open up shop in a land of lava and volcanoes). Don't underestimate his strength. This guy can pick his fat brother up over his head, even if Mario is taller via heli-suit while he is Mini-Luigj (after you take a mini-shroom, the little blue one) and throwing him. Luigi also has fought assorted boos and ghosts in his mansion, without a team like the Ghostbusters. So R.I.P. Thanos, Luigi is coming.
Yes this was a joke, of course, but if you think about it, Luigi actually probably would kill Thanos.
All Luigi has to do is jump on the top of his head and Thanos's body would crumble to microscopic dust as his soul is thrust into the inky blackness of death. So Luigi
(this is a silly answer plz don't take this seriously. But Luigi probably still wins.)