Murlock?
Undyne
Yes. You are correct.
Wait, who’s correct?
##EDIT:
Seeing as how @Arsenic has yet to give a description, I shall give one instead.
The character I am thinking of, is both crazy loyal, and just flat out crazy. He would give his life to protect the colony and queen.
BW inferno.
Yes. Now you give a description.
I’m thinking of a young man, probably a senior in high school.
his parents died tur to an accident in his grandfather’s lab.
eventually, his grandfather, a pioneer in Photon research, died, but not after giving this young man his magnum opus- a giant robot.
with this, he fights the evil Dr. Hell, and his legions of mechanical beasts, defending the Photon Power Laboratory.
The kid from Gigantor???
nope.
Then I have no idea.
it’s from the 70’s.
Just by googling Dr. Hell, I can safely say, that I have never heard of what you’re talking about. 
Alright, I’m still gonna do a do.
The character i’m thinking of is a lethargic bookworm (they definitely have at least one health problem), who also practices strong magic. Lives in a library.
This is utter Chaos…
Is it a pony? Also, wait your turn.
You’re not helping!!!/s
no, it’s not. And I had never used my “turn”
Listen, all I know, is that you are not able to give a description, until someone solves @Sammythekat’s description.
That one dude from that Mazinger show thinga ma boop?
I know the answer, because I googled it.
I doubt anyone will be familiar with the character…