Here are a bunch of spriting-related fun facts I’ve noticed throughout years of, well, splicing. A lot of them are probably well-known by now, but it doesn’t hurt sharing them!
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Several characters in FE6 and FE7 have a different outline color from the usual. (Gonzales is used for reference, he has the usual outline color) (Renault is very subtle, but there is a difference) (Echidna and all four bosses to her right use the same exact color, though interestingly the bosses’ various color swaps that aren’t present here use the usual outline)
Also, this Sophia is specifically from FE7. FE6 Sophia uses the usual palette. Here’s a comparison :

(Note she’s also smaller by a few pixels, probably because she slightly grew during the 20 years separating the game. The same also applies to Fae, although she only grew one pixel taller)
Also, the only characters in FE8 to have a different outline color are the flashback versions of Ephraim, Eirika, Knoll, Lyon and Vigarde. Here’s a comparison using the latter as an example :
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There are in fact official splices. I’m not talking about recolors, or characters who appear in both FE6 and FE7 and use the same base such as Marcus or Merlinus (though we’ll get to them later). It’s mostly just random bosses. Take a look. (I have slightly moved their portrait so it can be easier to compare, but I haven’t modified anything other than that. Also, the question marks are here because I’m honestly not sure they’re really a splice, they just seemed suspiciously similar to each other)
(oh yeah and also I noticed long after having made the gif that Puzon also uses Roach’s shoulder pad, so there’s that as well lol)

Anyways, about characters we see in FE6 and FE7 both, I’ve noticed Marcus and Murdock’s minimug isn’t 100% accurate to their appearance in FE7, because they’re visibly copy-pasted from FE6 with minimal changes to Marcus and straight-up just a quick recolor for Murdock. This is especially weird given how much effort went into making Bartre, Karel and Erick different. Merlinus is also there but tbh he didn’t change much and his minimug changed accordingly so there’s not much to say. Though I find it fun that some parts of his ponytails are recycled from when his hair was not in a ponytail.

(for those who can’t see it, FE7 Marcus’s minimug retains his sideburns from FE6, and his shoulder pads stay the same shape even though there’s a slight difference. As for Murdock, he retains the shadow underneath his eyes, his collar hasn’t been diminished, the trim of his armor (on the neck) stays the same shape, and the trim of his shoulder pad stays yellow even though it should be purple.)
And for those who want to see for themselves, here are the frames used for the two gifs (gives?), as .png :




