What have you watched?
Out of what you watched, which ones were more interesting?
Out of the above questions can you define it more? (e.g. you select Action on your site and you get a shit load of crap mixed in... so you need to pick another type... say Isekai to flush out the other crap) Does that make sense?
I don't know what "mc" means. Now "OP" means "Overpowered" with Action? ... Blackclover would NOT be something I would post, however it is a good anime to watch ... Is it Okay to pick up girls in a Dungeon" (wording may be incorrect) is good also, however it is not OP ... there is an Anime that is Called something to "My skill is OP" (something to that effect), dungeon crawling with some mild humor. All of these I mentioned is classed "Action".
There is another anime that revolves around "Didn't I ask to be Average?" (not correct name of anime) and she was OP, and it is Action ...
There are like 2 anime that revolves around the 8th Son... Aristocrat etc (action and OP), Assassin reincarnated (OP)
JuJuitsui (sp) Kaisen (sp) is good.
Loner Life in another World is OP... not that great
Instant Kill ability... not that great... however there are 2 versions.
Evolve Fruit anime... OP
Arifetu (spelling)
Gate / 2
Grimgar: Ashes and illusions (think there are other seasons)
How not to summon a Demon lord... more for younger viewers.
Knights & Magic... would have liked to see another season personally.
Slime / rishing sheld hero, overlord basically the norm
Think I mentioned the Finest Assissin re-incarnated.
My Isekai Life: I Gained a Secon...
Black Summoner
Ojisan in Another World
The Aristocrat's Otherworldly
I Got a Cheat Skill in Another
Mushoku Tensei: Jobless Reincarnation - Forgot about this one to add to Slime/Overlord etc.
My Unique Skill Makes Me OP (mentioned this earlier)
Am I Actually the Strongest? (did not really watch this)
The Eminence in Shadow (forgot about this one... too OP for my liking)
Spirit Chronicles (forgot what this is about)
The Wrong Way to Use Healing (found it amusing)
Re:Monster (didn't like, but still OP / Action)
Chillin' in Another World with
Tsukimichi -Moonlit Fantasy
My Instant Death Ability is So (mentioned earlier)
Failure Frame: I Became the... (I liked it)
There are more, I just posted Isekai ones I beleive. Good luck, I am sure you have watched 90% of these.