 If you liked
Kyoushoku Soukou Guyver (2005)
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 ...then you might like
Kiseijuu: Sei no Kakuritsu
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Both titles are based on sci-fi manga from the 1980's. Both focus on the main protagonist who is merged with an alien power that gives superhuman abilities and use their powers to fight off other evil alien monsters disguised as humans and both kills their enemies with gruesome attacks. The differences between the two is that The Guyver is more sci-fi action oriented while Parasyte is more psychological horror. If you like, you should enjoy the other.
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Recommended by Hellspawn28
These two anime have a young boy that gain superhuman powers from aliens. The main hero in these two anime have to fight other evil aliens while fighting their humanity. The main hero in both anime have share a relationship with their powers too.
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Recommended by Genocyberfanboy