Sometimes I feel the only one that actually like Knights/Generals. I mean, until FE6, they were pure garbage because Mov was super valuable due to the maps being big(especially in FE4) and lack of Spd aka the best stat in all of FE. But FE7 gave use Oswin and Wallace, and then FE8 gave use Gilliam and, despite many calling her useless, Amelia. Dunno how they did in Tellius but I know Awakening ****ed them up even in their design and the two avaible Knights being the most forgettable characters in their respective generations.
But man, did they make a comeback in Fates, Wary Fighter is the skill that erases their one weakness and Benny can tank for days while Effie OHKOes everything.
Anyways, answering the question: Pegasus Knights
I don't think I ever enjoyed using one of them, high Res is pointless when you can't counterattack Mages, they are all very frail and weak on the physical side, low Con makes their high Spd useless, prone to death by 360 no scopes and Wyverns just do the flying gimmick better. I sometimes even try to use the because the GBA Pegs are all cute girls and to get in my army you need to be cute but I dropped them all after either a stray arrow or having to stick Slim Lances to them that are as effective as me beating a wall with a spoon.
The closest I ever got to it was using Shigure in Fates... as a Kinshi Knight
On the case of units I hate on the enemy side, two words: GBA Heros
Heros are one of the few Jack-of-All-Trades RPG classes that actually manage to become Masters-of-All, unfortunately, that applies to the Red Units as well, which means they have a sturdy, strong, bulky and fast machine of destruction blocking your way to Jaffar before he suicides into Ursula. And for good measure they can also carry Axes and make good use of them because unlike Warriors or Berserkers they can actually see. The only thing you'll see, however, is a shield spinning in the air before a Killer Axe makes you black out