Well, the way i have him now, Ijok is impervious to any purely magical influence - fire summoned by magical means, or an earthbending attack will hurt him all the same, but something like Metz's Death Hand would be quickly nullified.
And to top that, he can harden the entirety of his body up to the point where it is just as tough as boron carbide - albeit, 4 times denser. If you cut off part of his body, he can just re-attach it, and the only ways you can permanently damage him is by hitting him in his weak spot, which is a grapefruit sized crystal ball protected by his body, and by burning him, which would require either potent chemicals, or prolonged exposure to temperatures of 1500 celcius and higher for any noticeable effect, even plasma as hot as 6000 degrees burning only 10-20% of his total body mass in the span of second.
To top that, he can throw punches at about 120-150 m/s (about 500 feet per second), containing over a million joules of force, and sprint at 80 m/s, which is far more than Shin is capable of, even though he is a melee superiority fighter as well.
When i was thinking mid-tier, i expected there to be characters who pick their teeth with with loaded guns and wrestle dragons to death before breakfast, so i made him very strong compared to my usual characters.