What if Tsukasa was a badass?

Fanfic author here,

I'm writing a mega-crossover that involves characters from various video games and anime being forced to band together in order to fight off a force too great for them to defeat alone. One of the series being crossed is Lucky Star, and Tsukasa plays a key role in the story. To make a long story short, an OC falls in love with her and teaches her to fight, despite her pacifistic nature.  After seeing Kagami beaten within an inch of her life, Tsukasa goes all-out on and completely obliterates her attacker using  previously-unknown powers.

I know that's pretty fucking OOC, but I have to ask: does this story make any sense whatsoever, or am I insane?

Only about as insane as the average fanficfag. In other words, you need detox. Today.