All other characters seem to have it so why not Akuma…even though it is obvious why people take him.
The first time I took him was mainly because he was so badass and cool-looking. I decided to make him my main because of that. But then I started getting my ass handed over to me by Ken because of the huge damage Akuma takes and my ignorance on when to use his demons. I shifted characters but I decided to come back to Akuma and try him again. And glad I sticked with him. He has devastating moves and amazing normals. And his huge list of moves make him such a versatile character.
But the actual reason I main him is because of the thrill I get when I play him. His health is so low that you know that if you make a mistake, you pay for it big time. So even when I play with my friends whom I have beaten umpteen times with Akuma, I still get an adrenaline rush.
Oh and the second reason - the mind games and traps (demon traps, baby) I can play on my opponent with AKuma.