Microsoft has just announced that Rash from Battletoads is available for Killer Instinct - starting today. He will be free to everyone who has ever bought any Killer Instinct-related content, including Season bundles, characters, accessories, colours, or even KI Gold.
Rare Replay owners can also unlock Rash for free by launching the "Battletoads" game in Rare Replay and thus unlocking the first achievement "Do You Have Battletoads?".
The offer has a duration though, and will end September 8. Rash will then be formally released in March when the just announced Season 3 of Killer Instinct begins.