Why do some anime characters lick their lips when talking about other characters?

Oian_2018 said:
because it´s edgy.
longer answer: because it´s edgyyyyyyyyyyyyyyyy.

Byleyg said:
To remark the evil/sadistic/erotic personality of the character.

Mizuti1 said:
It's an easy way to get across to the viewer that this character horny and evil. It's meant as a sort of symbol of sexuality but at the same time, like you said, it unsettles you so you know it's an evil sexuality.

Mizuti1 said:
It's an easy way to get across to the viewer that this character horny and evil. It's meant as a sort of symbol of sexuality but at the same time, like you said, it unsettles you so you know it's an evil sexuality.