The official Killer Instinct Twitter account posted a teaser today, reading "and there exists yet another powerful Coalesced Guardian in the form of a Japanese katana."
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— Killer Instinct (@KillerInstinct) February 21, 2017And that's it. No further information has been provided at this stage, so it's not clear whether the new character wields a katana, or is in itself a katana. Characters in Killer Instinct are called "guardians," which gives us confidence...