Suggested by Sonic All Might is the symbol of peace. He’s a hero who has worked quite hard to make it all the way up the ranks and his power is the real deal. Combustion Man is known as a pretty strong fire bender and is also feared because his physical attacks are powerful as well. He’s just not in the same league here and would easily get swept by All Might. Combustion Man is unlikely to be able to withstand a single hit from this hero. All Might wins.