yeah, he's def gonna get a lot more powerfull through "hard work" or smn and the entire manga will just be another adolecent story about managing school personal life and training his superpower, or he might just get some sort of boost or smn and become op right away who knows manga's are changing it up a bit nowadays
things are going to get heated haha(▰˘◡˘▰)
I only had to read the title to know this. Thermal Operator. As in he's in control of temperature... With such a vague title it's pretty much one of the most powerful abilities you can get if you train and power it up. As both close to absolute zero (literally anything and everything freezes solid) to supernova (so hot it disintegrates anything and everything) would be in his grasp.
Maybe the author won't go that far, but you can see that yea...his ability is definitely level 5+, even if it starts out weak.
I doubt the author would make a manga with a title like this if he didn't intend for the MC to evolve limitlessly. So I think with a skill like this he'll be able to heat the air around him to such an extent that other people would either burn or melt from it, completely melt or disentegrate structures, etc. At least that's what I would imagine is possible with a "Thermal" skill.