Fanservice FTW

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Tzion
Ohio gozaimasu.
LordNeko
I can't tell who any of those characters are save for Reimu and Marisa. Proof that Touhou rots your brain.
potato
if you can't recognize K-on characters you got a long way to go in the anime world, tiger
Phangry
Knowing K-ON! is more of a sign of knowing popular anime than a barometer for how much you have seen or knowledge of the medium.

It's the equivalent of saying that if you haven't read Harry Potter/Twilight than you have a long way to go in the world of literature.
Kaitou
I think he meant more in a "if you see a boy with glasses and a lighting scar/a shiny vampire and can't tell who they are yaddayadda" way.

No need to watch/read it, just know who they are.