My favorite anime character is ... Migi! From Parasyte.
Why do I like Migi?
Easy answer. Migi is one of the smarter characters I have ever seen, Migi is strong as well and very funny sometimes, parasites like Migi don't have gender but I will say "he" because it looks more like a male. So, he is part of an alien group that fell on earth and sneaked into people's ears to get to their brains and transform them into powerful and smart monster hidden in the society, in order not to be discovered and killed, with the only goal of destroying humanity and conquer the world. But Migi, is a special case, when he fell from the space trying to get into Shinichi's ear, the stupid parasite wasn't smart enough to get into his host's ear because Shinichi hit him with his hand while sleeping, (lol). So, since those parasites can't stay out of a human body for a long period of time, Migi had to take the decision to try to enter through his host's hand to get to the brain, but Shinichi was a nerd and smart enough to know how to stop it, and took a strip and twisted it around his arm, ha! so bad for the poor parasite that realizing he was dying for not reaching the brain at time, had to remain in shinichi's hand.
(Ok, so this an example of a successful brain invasion)
Following with why I love this character so much... After his failed invasion attempt, he had to live a life with his host, and talk to him every day. I like this character, because it has no emotions or feelings at the beginning, but he has to defend it's host from other parasites like him that reached their goal of becoming monsters, in order not to die, so basically Migi starts developing human feelings, and has to kill their alien "friends" to save his own life. Migi realizes that he can't do that, so he tries to move to another host's body, but since it was too risky he didn't try it anymore (such a narcissistic creature). But curiously, while this alien tries to protect Shinichi to protect itself, at the same time he starts to develop real love and friendship to him, and when Shinichi asked why he protected him if he has no feelings, he used the excuse that he needs to stay alive to conquer the world (this is not true anyway). Since he has nothing to do other than protecting the body where he lives, the little parasite decides to read human books, manga, watching television, and even giving advises to Shinichi with the same excuse mentioned before. He learns a lot of books in no time,learns Japanese in just 1 day and develops his own techniques to battle against enemies getting to be so strong he could defeat several parasites at the same time. Not to mention the smart parasite can be transformed into several weapons, such as a blade, a gun, a very strong arm, and even a key to turn on vehicles.
Yes, he speaks as well, but don't worry, most of the times he hides from people, except from Shinichi's girlfriend who discovered him, but ok, not giving spoilers over here in case anyone wants to watch the anime. I know this is not an usual character that people would like, however from him I learned that everyone has a monster inside, but always has someone who love and for whom to fight, maybe they don't let their beloved know how much they love them, but they do things to protect and look after them. Nothing else to say, this is the character I have chosen. Thanks for making me remind this amazing anime serie by writing this, I apologize for my still not developed English skills. I will proceed reading other contestants texts and go to sleep. Good luck everyone!