I hate doing personality. Really, half the time I don't even know how my characters are going to act until we get into the setting. So personality is almost always the last thing I work on.
but then strangely enough i often have trouble writing up a character's personality in detail, haha. i do always have a general archetype in mind that i want to go for i suppose, but to really describe them in-depth is somehow difficult to me - mostly because i tend to kind of work out their personality more through actually using the character in the RP, i think.
Wow, I am completely the opposite. I always work on the personality first and I use everything else to either accentuate or help justify my character's personality. I know some people find making a detailed personality restrictive, but I don't feel that way at all. I always leave room for my characters to grow or change away from the base SU sheet, but having a solid foundation for what my character is like at the start of an RP gives me a feeling of stability.
Personally I hate the appearance section. I just don't really have a brain for clothes or anything, so my characters end up in really similar outfits. I know recently there's been more acceptance of the use of pictures instead, but I find that really restrictive. One of the reasons I actually stayed away from RPing in places other than PC was that I could never find suitable pictures. I'm adapting, but I still find this section the trickiest.
I feel so old all of a sudden. xD