Dragon Ball Heroes has always fascinated fans with all the hypothetical, non-canonical forms that it continues to introduce. Some of this excitement comes from seeing characters like Baby or Majin Buu combine themselves with other enemies, while others appreciate movie villains like Janemba and Dr. Wheelo who gain power-ups that allow them to keep up with the modern Z-Fighters. Super Dragon Ball Heroes also reveals unexpected power-ups for unlikely characters, like Chronoa, the Supreme Kai of Time. There is also something to be said for how Super Dragon Ball Heroes expands upon the Demon Realm's role in the series, like Dabura and Demigra's fierce, new power-ups.
Source：https://www.cbr.com/dragon-ball-super-saiyan-rose-explained/
