For no real reason other than a desire to wallow in self-regard: My Top Five Characters Ever. Of all the characters I've played, they are the ones I remember with the greatest fondness.
Zone, the Shark Totem Shaman, from a Shadowrun campaign circa 1996-7. Zone was a native Hawaiian who had been savagely beaten pre-game and left permanently hobbled. (I used the bonus points from this flaw to buy heinous mechanical advantages, needless to say.) He had a tattoo of a hammerhead shark emblazoned across his back (cheesy as hell, but hey, I was only 15) and a great penchant for blasting people with lightning bolts. During his illustrious career he managed to, among other things, kill a vampire by severing its head with a power-axe, learn how to pilot a miniature submarine, blast two other player characters into oblivion in separate incidents, carry on an affair with a crimelord's wife, and eventually open his very own shark sanctuary with his ill-gotten gains.
'Twas Brillig, the Half-Elf Bard, from an AD&D campaign in the mid 90's, when I was in a deliberately quirky phase of my life. (I really did find that name amusing: what an irritating teenager I must have been.) 'Twas Brillig, who started off as a kind of comic relief character, ended up as one of the longest-lived and higest-ranking D&D characters I've ever come up with; I think he eventually reached level 14 or thereabouts. Most of his life was spent in Athas (the Darksun world) where he eventually became a kind of Gith overlord, with his own tribe of bodyguards to protect him from his Thri-kreen enemies.
Biscuit, the Minotaur Street Samurai, from another Shadowrun game. Biscuit was a Basque Separatist and demolitions expert who is now chiefly remembered for the sheer number of occasions on which he blew up either himself or another runner. He also, if I recall, had a dwarf sidekick named Yosemite Sam. (I believe this character also came from my mid-90s smart-alec quirky phase.)
Gorky, the Dwarf Fighter, from one of my forays into D&D 3e in the early 2000s. Gorky was an almost psychotically xenophobic creature, whose innate suspicion of any non-dwarf was only outdone by a monumental sense of his own greatness. He was probably the most fun to play character that I can remember - his unshakeable self-belief led him into all kinds of impossible situations, like trying with his battleaxe to chop down an oak tree full of crossbow-wielding kobold snipers, or leaping over pits full of poisoned spikes and falling in. But he always survived.
Maria Correia, the Solo, from a more serious Cyberpunk 2020 game. She was an ex-revolutionary who had been fighting with the Shining Path in Peru before abandoning Marxist ideals and becoming a mercenary. Over the course of the campaign she gradually gave up the pursuit of money and went back to being a Maoist again. I believe she is one of only two female characters I've ever played - and no, I didn't do a female voice.
What are yours?