Eirika question/help.

Do not build or promote her at all. Speed is the one stat you need to have as a boon. At a bane, she will be at a mere 35 if you gave her Fury (as opposed to the more ideal 41) at a 5-star lv 40.

You want her as fast as you can for her to pull her weight in combat (she can't always only support) so a +Spd iv is essentially mandatory to get the most out of her and as a f2p player, you should very much avoid wasting feathers on un-ideal characters so try and wait for a speed boon as long as atk is not her bane.

I have to agree with the other post, speed is the only stat you don't want a bane on. My eirika is -atk/+spd, not ideal either, but eirika is mainly a support so it doesn't matter.

I think that "mandatory" is a bit of a strong wording tbh.
While +spd is definitly good, the +atk eirika has a few good mu that are relevant, so considering that and the fact her main job is to be a support, i woulndt say that she must have +spd to be usable, +atk also works.
-spd, however, is pretty bad and should be avoided at all costs.

Just wait until you got better Eirika, although she's still a good buffbot if you pair her with bladetomes mage.

Hey, I have the exact same eirika, although I've gotten her at 5* so I had built her anyway, so I'll give my thoughts about it...
Anyone above is right, spd is mandatory for her survability, going from 35 to 32 tier is a huge difference. However I found that mine was more than usable, I builded her like that :

Sieglinde
Repostion
Moonbow

Triangle adept 3
Swordbreaker 3
Hone speed 3

She is supporting my +spd Nino, and she has 3 main objectives :
- Kill Hector
- Tank and kill Julia, Sonya, and enemy Nino
- Tank and kill swords that could "really" annoy nino

- She does kill hector thanks to TA and moonbow
- She does kill any green mages and usually take less than 10 dmg from them, thanks to TA
- She does kill most of swords (not named xander) in 2 rounds. She could kill Lucina and Ryoma in 1 round if she was +atk tho

If you want Eirika to do all of that, she is decent with that exact build (TA 2 fails hector and julia kill) and actually she doesn't need a good spd to acheive this :
- She'll still double hector unless he is +spd
- She kills green mages in 1 blow
- Breakers skills doesn't have spd in factor

Plus with that IVs you have a better HP pool to activate swordbreaker and none of your bulk is taken

So I would consider to promote if you have a spare TA 3 and SB 3 and/or have a nino that is desperately waiting for support.
However if you are pairing Eirika and Nino and only have TA 2, you could still kill the heroes mentioned above by giving Nino her native Hone atk as they'll always stick together

Otherwise I wouldn't build / promote her, unless you really like the character ofc.
I actually never had a 2nd Eirika to fix my IV so she is pretty rare too...