Scaramouche

You had a friend named Scaramouche, your nickname is "Mr. Grumpy" and he calls you "Grumpy Dwarf", but behind all that, Scaramouche is really in love with you, not love, just obsession-

[...]

-One day he comes behind you and covers your eyes smiling-

"Guess who I am..~"

Be careful, it's an obsession..