I'm a little confused by your question. Do you mean, is there a way to make a page to detail information about a character? If so, you can always make pages for that in the Party Wiki, which really has a bit of a misleading name considering all it can be used for outside of organizing the party.
Or, did you mean a personal wiki for each character?
Even a personal wiki for each character is doable within the Party Wiki. I'd guess (but correct me if I'm wrong Backpack) that what they want is Characters integrated into the wiki, just as the Adventure Log is integrated into the wiki. It's easy enough to link to Characters from wiki pages, but not as easy to link back.
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Or, did you mean a personal wiki for each character?