Normally I love to place characters in a different or bad light but with Percy I cannot invisage him being the next Tom Riddle. For one I dont think he has the gumption, by that I mean I dont think he has the courage or even the magical knowledge to accomplish half of what Tom Riddle did. Percy has some issues with his family being poor and I think that has effected him to some degree in as much that he feels he needs to stick to the rules so people will not think less of him because he is poor. But I dont think it would effect him enough for him to even begin to imagine the things that Tom Riddle was planning at that age.
I also can't see Percy being a Death Eater as there are little rules there, he enjoys feeling a part of society that is accomplishing things important along with being attracted to those in power.
I also can't see Percy being a Death Eater as there are little rules there, he enjoys feeling a part of society that is accomplishing things important along with being attracted to those in power.