CAA: Christian Anime Alliance

Byakushiki, a high-tech exoskeleton (dubbed "IS" or "Infinite Stratos Unit") capable of one-hit kills. However, not only is its most powerful attack its only attack, it also has a serious drawback - the amount of energy required to attempt the attack is so vast, it actually draws on its own shield energy to initiate any sort of offense. In addition, it also possesses another ability - "Ignition Boost" - that allows it to move at incredible speeds for a short amount of time. Unfortunately, this ability is only available once per encounter.

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Blue Tears

The next time someone tells you that you fight like a girl, show them a picture of Blue Tears in action - it's not big on speed, but it's a monsterous powerhouse when it comes to long-range combat. A third-generation Infinite Stratos Unit, its main capabilities enable it to face down multiple opponents at once. Personally, I prefer Blue Tears' combat capabilities to those of Byakushiki - however, in their very first fight, though Byakushiki lost to Blue Tears, it was only due to the fact that the pilot overused its offensive technique when he was seconds away from victory.

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Byakushiki Setsura (above, right) is the Byakushiki's second form - a seriously beefed up suit of armour with incredibley powerful defensive and upgraded offensive capabilities. In short, this is the Byakushiki on steroids.

Now, I just want to warn everyone - Infinites Stratos, the series that all the above mecha designs come from, turned out to be a harem series, which I stopped watching about three episodes in (I would have stopped sooner, had I known what a harem series was at the time), so watch and Google the series only at your own risk.

EDIT: by the way, I'm aware that the last picture (Byakushiki Setsura) is horrible quality. I would have uploaded a better one, but the picture was too large for the page. If you want to see a better shot of the Byakushiki Setsura, click here.