From the anime Inu x Boku. He's really cute but a bit too obsessed with the protagonist. But that didn't stop his sneaky charm.
It's really cute and funny how he wants to serve Ririchiyo.
Even though he feels like he's trapped in the darkness, if you seen the anime, Ririchiyo, became his light. So he wanted to be by her side in this secret service, but it turns out he wanted to be more. I won't spoil the rest, so if you're interested in this anime, check it out!