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MC is a useless necromancer until he meets ML, a vengeful spirit who used to be a famous guild master, and they establish a master-servant contract. Then you realise, ML's sheer power and constant teasing makes MC the actual victim here.
MC is a mortal author who finds out that he's in an arranged marriage with a water dragon deity.
ML is an S-ranked esper, which means that he is physically powerful and dangerous. MC is the only guide who is compatible with him, so ML wants to keep MC close to him at all times.
This case isn't as drastic as other examples on this list, but MC teams up with ML in a zombie apocalypse. ML is ruthless and lethal, and he is only concerned with keeping MC alive.
Zombie apocalypse setting. MC's group joins a larger faction and he catches the eye of ML, who is the deadly top dog.
ML is a shameless, clingy man-child in the body of a superpowered monster. He has no qualms in abusing his reputation to keep MC close; if fear doesn't work, then he will use violence.
While MC is a powerful person in his own right, ML sees through his civilian act in their first meeting and afterwards keeps bothering him.
The top is a famous gunslinging bounty hunter who can solo thirty men. His latest target is the bottom, who's going to get dragged to the sheriff whether he likes it or not.
Necromancer Survival