Zig Zagged: After sidestepping, the villain is revealed to not have spikes on his armor, but The Dragon is behind him, clad in spikes. However, the Dragon is actually a heroic Reverse Mole trying to get close to the villain so he can assassinate him.
Averted: The armor in the series is spike-free, or there is no correlation between spiked armor and moral character.
Enforced: The series designer is copying a culture where spikes are a symbol of power, or they plan to sell a line of "Synyster Spykes" armor for the evil villain action figure.
Lampshaded: "Wow, that's a lot of spikes he's wearing."
Invoked: The villain glues spikes onto his armor in order to look more impressive and menacing.
Exploited: The hero expects and somehow uses villain's spiky armor against him, maybe when the villain tries to body slam the hero he's nailed himself into the ground and is essentially stuck.
Defied: The new Evil Overlord, inheriting the old one's armor, cuts the spikes off because he thinks they look ridiculous.
Discussed: "No, we can tell he's evil. He has spikes on his armor." "Do they do anything?" "...No."
Conversed: Alice and Bob visit a museum and see some old sets of armor on display. Alice sees one with some spikes, and jokes that it must have belonged to an old movie villain.
Deconstructed: The spikes are too long to be functional, and it becomes obvious that no living person could do normal activities in them.
The spikes are a deliberate self-handicap: upon seeing them, the hero realizes the depths of the villain's poise and control, because anyone else would cut themselves badly trying to walk in that outfit.