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Either on your team as an ally, or on the enemy team. I am not talking OP, UP or balanced necessarily either.

I personally hate seeing Talon on the enemy team. Whenever I face one it seems like he gets beyond fed and just destroys the team.

As for my team, I dont really like getting Master Yi only for the fact that the people who tend to play him are complete jerks.

I hate seeing yordles on my team or the enemy team. I prefer them to be on the enemy team though so I can kill them.
Alistar jungle or bot lane is brutal if they can pull off the combo.. Ali has waay too much CC imo.
Shen is a tank monster, and with a Soraka on the team to heal him he's like immortal.
Sion is stupid and OP. I hate him, he should just be deleted. I've seen so many people feed or ignore their Sion and let him farm making him such a huge threat; it's gross.