Bonus points if the author first mentions a specific trait, physical build, or whatever else halfway through the novel and totally fucks up my mental image.
I don't expect a biology model description for each character, but write me something brief and evocative of how they should look, you fucking dork author. I don't even know how tall she should be, her hair colour, anything. Why are you like this, author?
I used to think this was utterly lame when I was younger, then I began to notice not many of the characters I read had particularly strong personalities. I much prefer characters I can't see myself in because just like in real life you'll have people who are majorly different to you especially in motive.
Kinda depends on your definition of "see yourself in", but yeah I get a lot of mileage out of being in the headspace of different characters narratively