Dota 2 guest character?

Hello, my name is Ari. Many same type of games have quest characters. LIke recent Tekken 7 with guest character Akuma from Street Fighter, he even took big part in story. What do you think if Riot will have 1 Dota 2 guest hero? If you would want to see it, wich hero it would be? (with balance rework for him).
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