Here are my top five.
Simon Belmont: The first Conan-esque vampire hunter that put the CV series on the map!
Samus Aran: The first Heroine whom has survived countless horrors of alien worlds, pirates, traps and even came back from near-death.
Mario: A renowned plumber from the streets of Brooklyn NY who, despite being slightly overweight can kick the @$$ out of all the baddies he comes across. And he's JUST A PLUMBER!!
Master Higgans: While he too, is slightly overweight, this guy really gets around! He's fought monsters, sorcerers and even aliens with their advanced technology...with only stone axes and wooden boomerangs! did I say he REALLY get's around?
Link: The hero of Hyrule who saves the kingdom time-and-again from the evil pig-like wizard Ganon. Every time Ganon is resurrected a century after his defeat, Link follows suit and the two just "Duke" it out for all of eternity. Now that's commitment.