Probably Shana?! She's so cute and innocent but yet she is kicking-ass Flame Haze!
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My newly made anime list 
http://myanimelist.net/animelist/PulseBreaker
 "Call my name, summon the PulseBreaker, and hell will break loose, its Flaming Sanctuary will rise up to the distant heavens and lighten up the placid darkness."
---Certified Shakugan no Shana Fan---
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