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Tear Jerker: Ben 10
In "Ben 10: Secret of the Omnitrix", when Ben thinks that Gwen just died. Seeing ourhero beating on the ground where she disappeared, screaming, "It should have been me!It should have been me!" is a very emotional sight, even more so when you remember that, despite his being a superhero with countless battles under his belt, Ben is all of ten years old at the time.
Kevin's situation. The kid gets forced to live on the street, rejected by everyone around him, and ultimately becomes a monster because he's unable to get over his image of himself as a "freak". This exchange from Framed really sums up how scared and confused he is on the inside:
Ben: You'd risk hundreds of innocent lives just to get back at me?
Kevin: No one's innocent! They just haven't made fun of me yet!