I'm looking for a novel, preferably a comedy, where the protagonist (famale or male) is so lucky that everything goes hers/his way. The protagonist preferably knows about hers/his high luck and abuses it. No harem or erotic novels, please.
I think at the point that OP is looking for it wouldn't be plot armor so much as "the entire plot is about this", like that sci-fi story about the psychic who could subconsciously manipulate probability, 'luckily' getting through all these dangerous situations only to find out at the end of the series that they literally can't and couldn't have been harmed because of their power the reader might've figured out, but they had no idea about.
Are we talking about plot armor Luck? (Mary sue style) or where "Luck" is a tangible part of the story. (I.E MC is the MC because hes lucky, not Lucky just because hes the MC?)
A Will Eternal. Pretty much every single protagonist of Japanese web novels (except for Kuro no Maou).
The Strongest Gene - The MC in this one is male. No harem as much as I remember. MC uses luck here literally. So I guess this matches what you want. Spoiler: Link https://www.novelupdates.com/series/the-strongest-gene/
Dinghai Fusheng Records MC was born under a rare star that gave him good luck. But once the star disappears in four years (it's been a while since I read it pls correct if wrong) he will die. He's sixteen, and knowing he'll die at age 20, he decided to take on the mission to save the world, since he knew his luck can help, might as well make the most of his young life.
My Sister The Villainess. It has just gotten to the part where the MC's luck is addressed. Almost everything goes the way he wants it to, the guy has everything and is warned that the rebound from being so fortunate will probably appear soon. The MC ignores the warning because he is strong, but worries about his sister since he knows her rebound will occur in a few years. The guy is in a world of a game series he played in his previous life (there is definitely more to this than meets the eye). He is born as the incredibly attractive brother of the game's villainess from the first game. The MC hates this at first because in the sixth game there is a random chance the brother will appear and steal the hero's harem away with his good looks (this happened to him once and he had to reset). Warning: The MC is insane, anybody from his mother's side is insane. This is explained in the story but don't worry, the book is not a horror novel.
How is no one suggesting Konosuba? Kusuma has a high luck, is aware of the fact and abuses it in a regular basis.
To Be a Power in the Shadows https://www.novelupdates.com/series/to-be-a-power-in-the-shadows/ MC straight up tells shit, and it ends up happening. He just does whatever he wants, sometimes just taking a walk, and situations keep happeming. In the end, his followers/friends think it was his plan all along caus it fit so perfectly. Plus, it has very good comedy too