-Spoiler Contents Below-
Adam Grant is a beyond Omega rank mutant, similar to Franklin Richards, the only difference being the nature of their abilities.
Franklin has Reality Manipulation on a Multiversal Scale, while Adam has Reality Manipulation on an Infinite Scale (Based on his energy levels).
So, while Franklin will stop growing at a certain point, Adam won't. His Reality Manipulation allows him to transform matter into energy, and this energy can easily rival, if not surpass, Power Cosmic in terms of potential.
In Adam's hand, this energy can create universes, life, control space-time, manipulate matter, and so much more.
In the story, Adam's strength is highly nerfed due to Eternity suppressing his powers. Adam could turn Eternity into energy, but he couldn't fight Eternity.
This was simply because Adam works like Galactus. If he is full, he can fight anyone. If he is not full, he can easily be defeated. Since Adam didn't get to use his powers to get stronger before Eternity suppressed him, he became a Dimensional Lord.
From then on, the persona of a dimensional lord was born, which was also his real body now.
He has given himself a new name- Kurama. This is his real body, but it is bound to the pocket dimension, which he calls Naruto Universe.
As a dimensional lord, Kurama can manipulate matter and energy, control space-time, and has superhuman strength, speed, endurance, and regeneration. He can also utilize Adam's primary power, Reality Manipulation.
He has made three clones- Adam Grant (Mutant), Naruto (Human), and Tobi (Mutant).
Since his powers are just like Franklin's, Kurama has given his clones, Adam and Tobi, some mutation through the X-Gene.
Adam Grant can control matter, reality, energy, space-time, and magic through his direct relationship with Kurama. He is on Omega Level and is much stronger than most Omega Levels.
Naruto was bestowed a power similar to KCM, but much stronger since Naruto in his base is just a regular human. So, just imagine him doing anything that Naruto can do. He is also on Omega Level.
Tobi wasn't given any specific power from Kurama. His eyes were mutated to give him Kamui, and he can also access a higher level of Chakra. He can also use Susanno.
With these three clones, Kurama can do whatever he wants.
Creating personas helps him manipulate the world without sounding or becoming a villain.
While Kurama, Tobi, and Naruto would often appear in the story, the main story will still follow Adam Grant since he is the main character.