thank uu and phewww i don't know if i'm qualified to give tips lol but i'll give u my thoughts.
when i'm designing characters i always have a very clear image of what i want them to be/what features/what theme i want them to have.
basically u can sit down and think about what u find sexy in a character and then just make one that's an amalgamation of all those things lol. u can always tweak them after the fact anyway.
they don't even need to be "aesthetically" pleasing as long as u find them fun to draw imo. but if u want to spice their design up u can always just take a look around and take inspiration from fashion styles/color combos/other ocs etc.