HOW STRONG IS ADAM IN HAZBIN HOTEL?
Let's try to answer this question using science.
Adam's body not only can produce much more energy that could ever release inside a fusion reactor, a nuclear bomb or even the core of a star; it also has enough resistance to remain intact without effort despite it contains that energy constantly. Regardless of how such energy is produced inside Adam's body, it must be contained otherwise Adam would just explode. And Adam apparently is able to contain it without even shedding a drop of sweat. This means that Adam could literally walk on the surface of the Sun without the slightest damage. And this without even counting his power to create interdimensional portals (basically wormholes), since if we insert it in the equation Adam should release more energy than the pressure in the core of a neutron star and resist the gravitational squeezing of a black hole, making him unkillable even by the strongest force in the universe.
With all this power, if he was able to control it and release it, Adam could push himself to the limit of the laws of physics. Since he has such resistance and he can release so much energy, he could accelerate until he would come very close to the speed of light (even if he wouldn't be able to reach or surpass it), making him able to travel interstellar distances in an "acceptable time". If that energy was instead concentrate in a part of his body, for example a punch, it would be so intense that even the movement of the air in front of him would cause more damage that the entire US nuclear arsenal. Basically, he would obtain a very similar result to Saitama when he hit Boros (One Punch Man).
With so much power, Adam would surpass the majority of fictional characters, leaving room to fight him only to people like Superman (DC comics) or Omni-Man (Invincible). This two characters would be some of the few that would be able to fight him and win since they are able to travel faster than light. Any other character would be defeated almost immediately thanks to Adam's immense speed and power without even being actually able to fight. Even people like Thanos, Ego, Thor or Hela (MCU) would be defeated in a matter of seconds. This would place Adam as one of the most powerful characters ever to appear in fiction.
The difference between Adam in the various fanfictions and Adam in the canon is precisely that in fanfictions usually he is able to use such power properly, due to good backstories that forced him to accept that he is not invincible. Adam in canon instead never had the reason to train to control his power because once became an angel he was already much stronger than any opponents he faced and he never really had to fight.
This is basically the key difference between the two Adams: the fanfictions' one is warrior, the canon's one is just a big bully. Which is truly sad considering how much potential Adam had according to science itself.
