I try my best, although it's hard to simulate either of my hairstyles (shaved bald or thinning) in many games - usually I have to settle for a close buzzcut, as in Mass Effect - and my usual beard (a squared-off goatee) is often unavailable as well. Also, many games refuse to let you have glasses.
This dates back before videogames, actually - whenever I learned a new RPG, I'd try to build myself, or at least a version of myself appropriate to the system, to demonstrate to myself that I understood the rules. Thus were born Jonath the Younger, half-elven ranger/mage (the only way I could simulate my breadth of knowledge, under D&D rules); Bluestreak, the speedster/flyer who couldn't fly higher than eight feet off the ground, in Champions (I have Psychological Limitation: Fear of Heights, common, disabling); an accidental Gangrel Kindred (mistaken for a survivalist by his sire) who laired in a small mountain town and had reached an agreement with the local Garou tribe (he didn't make them notice his presence, and they didn't roast his heart on a stick), in Vampire: the Masquerade; Vulcan science officer Lt. Samek, of the scout-class starship USS Unicorn, in Star Trek: the Role-Playing Game; Capt. John Silivas, former artillery commander, now first-shift driver of a HMMWV with the unit's combat medic aboard, in Twilight: 2000; and a handful of others I never actually got to play.
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Sodium is a metal that reacts explosively when exposed to water. Chlorine is a gas that'll kill you dead in moments. Together they make my fries taste good.