You definitely understand romance. It isn’t just about looks. Whenever I am writing, I tend to ask myself what would make this character “hot” on episode but stand out further than the standard. My thing is: I would pick a few cartoon characters that I love moreso because of their personality. They may be good looking cartoon characters, like Sebastian and Ciel from Black Butler or Hiccup from How to Train Your Dragon, but what makes them “hot” is their ambitions, intellect, and mannerisms.
So, how can I make an ink or a LL character stand out of the normal “hot guy on Episode” standard? Create a flawed, yet, good-hearted personality. A person isn’t fully “hot” until they have a reason to be. Therefore, my supposed “hot” brazilian chocolate butler is the inevitable love-interest/MC. The EIFJ-A Type (Extrovert, Intuitive, Feeling, Judging, and Assertive type). His best personality trait is his broad-minded, flexible intelligence as well as his tender and elegant loyalty. His worst trait is his pessimistic or insecure attitude toward himself. And, he can be the bad boy who is vey manipulative and suspicious until the reader finds out his friendly intention. My butler character may be the only “bad boy” on episode to not act or be “bad.” Yes he had a terrible background, but out of it he became somebody to help people rather than “hurt them and smoke junk” like the usual bad boys. But, just because he is nice, don’t mean he isn’t bad. Mess with his employer and the antagonist can kiss his ahh-attitude! There may be children present.