Super Saiyan 4 has a tail and I’ll be explaining why.
Why does super saiyan 4 have a tail?
As far as we originally knew the user had to become a great ape to satisfy the requirements to do so.
But all that changed once we reached Dragon Ball Daima.
The canon series proved that Goku can in fact reach Super Saiyan 4 without needing a tail.
He finally unlocks this power once his final battle with the demon king happens.

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