Tons of 'em, but the hero always get some kind of OP ability to balance that.
Like, for example, Tondemo Skill de Isekai Hourou Meshi.
The MC is a peasant who was accidentally summoned alongside three great warriors. He has shit for stats and can't fight worth a damn. But he gets a skill called 'Food Menu' which lets him summon food from Japan, which boosts stats for people who eat it and is considered OP as hell
In re:Zero the MC's secret skill is being able to be reborn no matter how many times he dies, with full memories, so he'll eventually overcome any obstacle through planning and by knowing what will happen.
Or an MC who finds a LITERAL cheat console and gives himself perfect stats and OP abilities.
Or an MC who becomes a king of a country solely based on his knowledge. He then recruits amazing heroes from seemingly strange criteria that end up solving all kinds of problems in the country.
The point is that no MC ever stays weak, they always get some crazy OP skill that makes them super powerful in some way.