So I got a 5,000 Feather Login Bonus in FE Heroes. Which means I now have enough to make a 4-Star into a 5-Star.
Gonna do a Blue Unit since the banners refuse to give me a 5-Star Blue. Who do you guys think I should choose?
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Of those, I'd probably go for either Corrin, Robin, or Reinhardt, personally.
Cordelia will destroy reds, but she's really fragile otherwise, so if you like units with a bit of bulk you might want to look elsewhere. Sharena is much the same; I think her main appeal is her buff skills, so if you have those covered, again you can probably look elsewhere.
Robin is really effective against colourless units, especially if you give him Triangle Adept to go with Blárraven. Statistically he isn't the best, but being able to mop up archers in one hit is always a good thing.
I really like Corrin's physical bulk and debuff skills, myself. She deals magical damage, too, which is nice since most physical attackers have poor resistance. I personally prefer her over anything Nowi offers (except Nowi's higher Res); if you want that Distant Counter, just have Corrin inherit Nowi's attack skill (but those debuffs...). I'm considering promoting Corrin myself once I get enough feathers.
As for Reinhardt: Is he +Spd? If so, drop him and wait until you get one who isn't. Once he promotes he will want to get Dire Thunder as soon as possible, and after that his speed basically ceases to be relevant for all intents and purposes. Ideally you want him with +Atk -Spd. Once he gets Dire Thunder, the real fun begins: throw Death Blow on him, ideally a bunch of cavalry buffs (he works best if you go full Horse Emblem), and send him off and watch him delete everything you encounter (assuming you don't encounter anyone named Julia or Titania). He is a pure player phase unit, so if you aren't going Horse Emblem you can probably ignore his defensive stats too in large part (they aren't
that bad, to be fair, but he's getting doubled by everything in the game anyway so it doesn't matter as much overall). If all-out offence isn't your thing, though, you can probably pass on him for now.
If you want a suggestion out of left field... Jagen is surprisingly good in this game, especially if you're in need of someone to tank magical hits. He has the second-highest Res stat in the game, and comes with Aegis to boot (though you could also give him Glacies if you want him to deal more damage, too). Give him a Rally/Hone/Spur Resistance, and he is basically immune to most forms of magic save -wolf tomes and strong green magic. If he is -Res, though, don't bother since his Res is the whole reason you'd use him.
Clair and Shanna have decent Res too, and are really speedy, but I don't care much for them overall compared to the other lance fliers on offer (Catria is my preferred option from the lance category in general, personally, though I haven't happened across an Ephraim or Effie yet).
If they have to fit that team specifically, though, that team could use another physical attacker, so maybe Cordelia or Sharena would be best in that case.
How do you even get the stuff to promote 4 stars btw?
The great badges? You get them from the higher levels of the Training Tower. They are randomly given out, though, so you could do the 10th Stratum endlessly and still not get many of them. Or you could do the 6th Stratum once and get a ton of them; it goes both ways.