The rumor is that a new app for DLR should be debuting tomorrow, so hopefully that one (being officially maintained by Disney) will include that type of information. I checked Disneyland Wait Times and Mousewait Disneyland and I didn't see character times and locations listed on them (aside from a few of the 'permanent' meet and greet locations, e.g., Princess Fantasy Faire). I don't think the roaming characters are generally listed because they change locations and who is out on a fairly frequent basis.
Also, any of the character handlers with the square "Ask me about characters" buttons should have (or know who among them has) the master schedule for the day of who is supposed to be where (barring wardrobe malfunctions, etc.).
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