I like the Rapier idea for Marth a lot. Although, that has the possible side effect of making him the new Caeda...I think he should be able to kill Medeus in H5 at least. It's kinda ridiculous that he's supposed to take down Medeus and he's doubled by him no matter how much you train him. Perhaps raise his spd cap to 27 and alter his spd growth a bit?
As for Avatar, I'm still not convinced by any of the stuff presented. But oh well. I think altering class bases and other stuff is a given to relabance the avatar though. Perhaps we should discuss him/her again some other time?
Day 2: FE11 Frey and FE12 Luke
Poor Frey, this character got the shaft when they decided it was a good idea to not include the Prologue in the Harder Difficulties. He's completely unplayable in anything higher than Normal. Of course, first thing would be making him playable in Hard 1 and above and then rebalancing him. Assume that he's playable in those difficulties.
And FE12 Luke, generally considered a high tier unit. He's a growth unit that joins really early, so he has a lot of time to get exp and become one of your MVPs. Weirdly, he's almost never found in his base class aside from the Prologue. First question would be: would he need nerfing at all? or is he fine as is?