For me personally, the two love interests within my story are based off of a mix of characters I've seen in dramas or movies.
The main character, is sort of based on me and a mixture of what I want to be. Though she is judgmental at first, her personality in itself is the headstrong type of person.
The first love interest, is inspired by the characters I've seen throughout many dramas: the typical, nice, flirty second lead. You know, the one who acts silly, but is genuine and manly in serious situations.
The second is inspired by of two things: the main lead in the webtoon 'cheese in the trap' and the guy my best friend fell in love with (lol).
