•Kazuma is an alter. Alters are people that have the ability to break down organic or inorganic matter to transform/enhance themselves or create powerful weapon/items. Kazuma's original alter ability allowed him to turn his arm into a weapon with "bullet shells" full of kinetic energy behind his shoulder blade. When he unleashes a shell he is propelled at high speeds which allow him to deliver powerful strikes. As the story advances, his power grows until his "Alter" ability takes the form of an entire body armor.
Strength/Destructive Power of Alter Ability:
In a fight with his rival, an equally powerful Alter. It was implied their fight created a magnitude 8.5 earthquake.
In his lowest level of strength he can punch the ground hard enough to create fissures that stretch for meters and launch people several feet in the air and away.
His weakest "shell" gave him the power/momentum to collapse an entire office building with one blow. In his final form, his "bullet shells" can generate energy beams that have the range and power to destroy anything within a hundred to several hundred kilometers of him. His ultimate punch is strong enough to launch beams of energy that escape into outer space and still form a crater hundreds of meters wide on the ground.
Dimensional BFR punch tears open the fabric of space and time to create a rift to another dimension, then he can throw opponents into and trap them there.
Described as being "massively" hypersonic (<Mach 5) via propulsion from whips on his back in his final form. He also has light speed reaction time (supposedly).
Can use his "Alter" abilities to accelerate his healing factor to heal severe injuries in moments. Considered to have continent-busting durability.
In my opinion after a bit of research, I would deem Kazuma of S-CRY-ed as a <High Planetary/Low Cosmic Threat and High Tier 3-Low 4 Threat according to the tier systems of: @universalranking @collective_tiers