1. What kind of protagonists do you like?
They are not too snobby and cocky. Nor are they too perfect (Mary Sue vibe, can do no wrong, nailed everything right of the bat, well-liked, etc.). I like humorous protagonists that have growth development, and doesn't make/do things out of their character. I think lot of people like protagonists with sarcastic edge (from what i see on wattpad + a few books) but i kinda like ones that aren't always all that, since not every protagonist (person) is sarcastic. And humor does not always have to be represented by sarcasm, can be in many different ways.
TL;DR: I like protagonists that are somewhat realistic or "believable" and makes sense, some flaws, and has a funny bone.
2. What kind of villains do you like?
Well-developed ones. If you write the protagonist side well enough, many cases readers will also side with the mc and be against the villain, sometimes even if the villain was not in the wrong. It would be really interesting to see villains that sometimes make you think, you know depending what they do, they may actually be doing good. Like a general fighting against the protagonist; maybe their king is bad, but they are fighting not for them, but to protect their home country. Or how a good character slowly turns evil; its kind a slow torture to see that way, but many evil ones were probably not evil to begin with but became so because of their environment, situations, or interactions with others.
TL;DR: Villains that are not evil just bc for no other reason, but have ulterior motives and actual reasons that made them turn evil or antagonistic.
3. What kind of supporting characters do you like?
Some characters that are interesting and have a backstory, not just some wallpaper or an extra prop for the protagonist. They have reason or cause to be there, and don't just stop being useful or essential to the plot, after a few arcs unless some explanation is done. The most interesting characters are ones that you don't get that much info on them, but back on the interactions and slowly through the plot, you can come together to piece a subtle story about what their past was or what they are like. The best part is piecing those things together since its not directly told straight away, since these support characters' backstory shouldn't be as important as the protagonist's story that it distracts the mc's story to theirs. then its consistent.
TL;DR: I like supporting characters with some backstory to them. Their stories don't overtake the mc story that it derails the main plot focus, but has just enough hint of intrigue that makes them captivating. + they aren't just props but and forgotten, but help support mc and plot actions.
4. What kind of romances do you like?
One that makes sense. One that doesn't use some plot types that are so overdone that its become a cliché and definitely not ones that are very questionable and border to the point of harassments, abuse, and even …..stuff. I have seen read a bit of some stories like within few chapters or first chapter, and they pass off some sort of abuse or creepy stuff as romantic that would be really disgusting irl. No hotness cannot always excuse a character's actions. And one right choice shouldn't always be a sign of forgiveness for all the horrible things they did to the other. Like say character cheats, abuses, discards, doesn't stand up for character through many events, and at the end supposedly the character seems like on the path to still falling in love with that character. So again, for the believable characters part. Also has some chemistry and not just flat that you have to go look with a magnifying lens to see what tiny strands hints of romance between the characters. You heard about character development, well now you also wanna see relationship development (even if nonromance).
TL;DR: Relationship development. Romance makes sense. Has chemistry. No creepy, harassments, abuse, assault stuff that is excused just bc the romancing character is hot, and so the mc keep subjecting themselves to those things that realistically would be a hell no to that relationship.
Conclusion: Characters and relationship development. No branding as simply just evil, but have reasons why they became that and their motives make sense. Realistic or believable characters in their interactions. No harassments, creepiness, abuse, etc. taking lot of crap from others and just simply forgiving them and falling in love with them in the end, despite all the things they have done to them.