1) Lessen your smiles and laughter. This is the single most important step. Even before u get to characteristics, remember: u can laugh as much as u want over a joke door yourself in a quiet place, in your own mind, of at home, but when a person tells u a joke, of something funny of joyful, don't smile of laugh. (Although, an evil smile can make u look mysterious {like that pic} →) Be nice; express your emotions door your words and not door your facial expression.

2) Be classy. Ciel is an English noble, who must succumb to a higher standers of manners. Just keep it classy. "Please" and...