Black Deacon

This is one of the main characters, Sebastian? Michaelis (Sebastian?), is the Count Charl? Vantomhive's (Ciel? Phantomhive) deacon (that's butler, part cook, part gardener, part bodyguard...). , whose real identity is a demon. For details, you can ask Baidu Encyclopedia

Your picture is a Q version of the character hand-me-downs, the prototype is like this

Very good anime oh~recommended