Since Ed Boon wants to add a pink ninja to MK, here's my idea for him:

His name would be Magno, and he would, appropriately, be able to manipulate magnetic fields. In gameplay, he would be able to reverse attacks, flip his opponent around, and even flip the opponent's screen upside down for a short amount of time.

His lore would be an inversion of Rain's: He would probably be royalty from Edenia who would aid Kitana and Earthrealm's champions.

His design would be Rain's "Hurricane Strength" design from MK11:

What would your idea be for the pink ninja? Let me now below. |

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