Normal for Conquest and Hard for Birthright and Revelations. Obviously there are other characters that are extremely OP, its just one throwaway example you absolute autist, but yes its possible:
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So the only thing she gets doubled by are really good swordsmen (that do no dmg anyways). The only remote risk is very high level mages (of which she has above average res and very high HP so its still a walk in the park). Speed also isn't an issue since its above average (not to mention Brave Lance). In the worst case scenario, she can solo with a healer as support, but this just shows just how absolutely busted this game is. You shouldn't have the ability to put warp on a fucking knight...period. I literally just played the game normally and this is how broken my build got.
As for the sword/axe/lance/mounted killer character:
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It's just stupid. Look how retarded this shit is. Where's the weaknesses? You could argue that maybe she could use more HP, but with the frequency this game shits out stat items that's hardly a problem. Nothing like this is even possible in the classic games. I honestly wonder if ya'll have even played the old school titles and are just basing your assumptions on GBA and beyond. Honestly not trying the throw shade, I'm just surprised given how common it is to point out Fates being a busted unbalanced mess among FE oldfag circles.
>Normal Mode Conquest
It all comes together.
Normal mode Conquest and hard/lunatic Conquest are very different games. I too thought Effie was a stomping machine, then I played hard mode and she got smashed by defense seal in chapter 10 and died in three rounds, same with Camilla too if you just throw her at everything. Oboro in particular is an absolute threat to anyone not named Camilla in chapter 10. Also lol bragging that you owned normal mode in any Fire Emblem ever. Every FE is sleep inducing on normal mode unless you are brand new to the series, I would figure some oldfag like yourself would know that.
Two things of why Normal mode is different: Staff Savant (makes staff uses infinite) and whatever the skill is for Master Ninjas that makes their debuffs stack infinitely (even down to zero). Also the face mask monsters explode when they die in the late game and deal damage to everyone near them so in the stair chapter (without fly cheese which Effie generally won't abuse) and the final chapter you get thrown on a clock to win before getting overrun. Among other various stat differences and additional skills enemies get.
Staff Savant Hexing Rod cripples you in chapter 26 where solo turtling slowly will likely gut you without a ton of planning and careful movements and debuff stacking makes straight tanking ninjas kill you in hard/lunatic mode. Unless you are some LTC god, good luck and every FE has some LTC cheese in it especially ones with broken warp staves this is nothing new. Also mid/endgame Ninjas commonly have lunge and are usually placed in such a way that if you tank them you go on a lunge train until you die as debuffs stack forever, poison strike chips you even if you take 0 the first hit, and once you get debuffed twice you are likely dead. Even if you somehow live you have no strength and will die next combat most likely. The answer is usually to aggressively kill them in player phase, because tanking them is not a viable (or at best a very dangerous) option.
Defense seal on spear fighters, a fairly common enemy in Conquest (chapter 9, 10, and 12 notably), also gimp your bulk in the early/mid game so Effie goes from taking maybe 0-3 damage to 6-9 damage a hit and she likely gets doubled. Also EXP is gimped in harder difficulties, so over leveling is harder and raising Mozu is an annoying task at best even worse then usual because the enemies are harder to kill and Conquest units are a lot slower on average compared to the other routes save for a few exceptions.
In addition if you want to flex on how good you are as a oldfag at least play with what is generally considered "efficiency" as in playing with some need for some amount of turn count speed, because if you raised Mozu either the normal mode experience curve is super generous or you just plain don't care about effienciecy in which case Amelia is a great unit by this logic which by any other metric is dumb. Mozu is one of the worst units in Conquest because she slows down the game to be made an even usable unit and she still falls behind because Xander/Camilla/Paladin!Jakob/Corrin/Leo/Keaton/Selena/Silas/MostChildren/etc exist and don't start at a shit level with barely worthwhile growths for the effort. The only unit I can think of that is worse is Laslow, but at least he had the decency to come at a reasonable level and the only reason Mozu edges out is due to her unique classes for Conquest so she can become a flying archer beyond that she sucks and isn't worth the effort.
Also "muh Kaga games" the ones where in OG Gaiden Alm and the character now known as Kliff were the best in the Alm sections and the other two trainees sucked (especially Tobin), Dread Fighters were gods (still are in Echoes), Warp cheese is plentiful, and Sigurd can almost solo his entire section himself without much care because Holy Blood and Tyrfing, Seliph is the best unit once you raise him in FE4 because holy blood. Every FE is broken to some degree and you can ltc 0% growths just about all of them, I only brought up GBA because you said Conquest is easier then Sacred Stones which is a dumb take unless Seth killing half the map is harder then Ninja trains killing you because you dared to enemy phase them or Kitsune suicide killing people because you didn't climb a mountain. Ironically the hardest FE game to Iron man (or close to) is probably 3H because the highest difficulty is stupid high and you get no prepromotes to save you if someone dies early despite all the broken shit that game has.
I raise your autism with my own.
Edit: By the way the whole "LOOK AT HOW BIG MY STATS ARE" screenshot doesn't matter because it only matters relative to what you face. If you had a million hp and a billion speed, who cares if Ninjas have the same relative stats and debuff your stats by several thousand. This is why difficulty matters. Some games the enemies are tuned like shit relative to what you face, like hard mode 3H or most normal modes. Lyn for example looks amazingly fast because of high speed so she doubles everything, but FE7 enemies are slow as dirt most the time so slower units can double anyway so it doesn't matter if her speed is high same with a lot of Sword Master units.