Seth
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I can recommend a few which are darker, mature, or have little to none of the style you mentioned.
FMA is good, but I can see your point. Edward and some of the other characters tend to go full chibi sometimes. xD
				
			- Death Note - Kid finds a book that kills people when he writes their name in it, "befriends" a death god, becomes a serial killer.
 - Shiki - Mystery/horror where vampires take over a small village. It makes you question who the real monster is.
 - Blood+ - Pretty damn serious, lots of vampires, blood and death. Story'll keep you on edge and wanting more.
 - Claymore - Buncha women with super human powers kicking ass.
 - Hellsing Ultimate - Vampires, action, and bloody goodness. Alucard is an unkillable badass. AVOID THE TV SERIES
 - Ghost in the Shell - Great sci-fi/action anime. You'll want to check out Stand Alone Complex too.
 - Beck - Art style is way different and doesn't have the expressions you mentioned. That aside, it's a fantastic music anime.
 - K-on - Bunch of girls killing things with their musical instruments..... (jk avoid this one xD)
 
FMA is good, but I can see your point. Edward and some of the other characters tend to go full chibi sometimes. xD