Jaqueline Wilson gives me the creeps, but her books do seem to be very popular with reluctant readers, so I suppose there's something to be said for her.

I think I may once have read a children's story which featured an unpleasant character who wore lots of rings, as I find this habit of hers particularly off-putting - and that's certainly not a logical reaction.

(Unless I'm thinking of Umbridge. But I don't think so.)