well, I've been waiting for someone to ask and here I'll explain.

I use the 3-pixel arms because, to me, it looks more visually pleasing. I also think it is more anatomically accurate- Legs are bigger than Arms and the 4-pixel template doesn't really reflect this. I think that''s quite a simple fact, and even if you want to argue otherwise, I think it fits better with an anime art style. Feel free to make your own 4-pixel version to use in-game, but that's why I make even male skins with the 3-pixel arm template.

definitely one of the better written villains, at least in the more recent games, but maybe thats not saying much. Ian Sinclair does a really good job at his voice, even if the direction can still feel a little off (but that's just game voice acting for you) and for once he's a villain who isn't either a member of a dark cult or some kind of thug. It's tricky to think of any recent villains that aren't.

Yeah, Lyon's pretty good too, but I just don't think he got a lot of development, and Eirika's route's version of him just feels a bit plain. Eirika never really comes to terms with the fact that he is gone, not until the ending at least, so it doesn't really feel like she develops as a result of him, and Ephraim's version is just the same old possessed demon thing.
sorry, i always make a wall of text out of everything, don't I?