That last panel needs a "Haters gonna hate" caption.

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I imagine these following situations for a few others...

houjou hibiki: this: (http://img4.wikia.nocookie.net/__cb20120413210201/strikewitches/images/1/10/Insignia_of_Liberion.svg) as a tattoo somewhere on her body.

ellen: having this thing: (http://www.imfdb.org/images/d/d7/SwordCutlass9mm.jpg)

hino akane: singing "kokoro no chizu" in private, as a reference to one of her seiyuu's past works...

natsuki rin: acting like a kunoichi- (that's a reference to her seiyuu)