So, scope of 20-24.
6 confirmed.
Marth, Chrom, 4 OCs.
3 "all-but"
Corrin, Lobster, Xander.
9/20-24.
5 I can't see not making it in.
Tiki, Robin, Tharja, Camilla, and Takumi. I feel like all of these are self-explanatory.
14/20-24, leaving 6-10 left. No lance users or true villains so far.
Camus, Medeus, and Garon all seem villains to get in. Camus being an archetype-establisher, lance user, and one of the more popular of Marth's games. Medeus being og villain (and final boss of TMS#Fe) and grand draconic finale. Garon has the big bulking axe user niche and a middle ground in evil of the other two.
Cordelia, being high in popularity and a pegasus knight, seems like a high likelihood.
A variant of usable Anna... is something I fear is gonna be overlooked.
Lucina, despite raw popularity... feels a little off to predict for some reason. I feel like likeness to both Marth and Chrom in bits and pieces leads her to be skipped or at least held off for another time.
and
seem like perfect heralds for DLC.
Lyn and Hector seem like perfect heralds of a sequel.
Alm and Celica are somewhere between.