I think spoiled brats make really good rivals, pursuing similar ends to the party for their own sake. Getting in the way over and over, but not crossing the line where it would be acceptable to kill them. Antagonists but not true villains. Repeated encounters, especially if they lose some, can help them become more developed and likeable. A spoiled brat who eventually learns humility and becomes an ally is a very satisfying arc. One other thing I like about spoiled brats is that being shallow and vain is a good reason to make them fabulous! Sometimes you wanna go full camp villain, and the rich kid who simply must be the centre of attention is a great candidate.

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