Selena

The Attack +3 Seal with an Attack boon gives Selena a respectable attack stat while maintaining a solid speed tier of 38 due to fury 3. This build also maintains her defensive stats making her a formidable melee duelist. The ideal bane is Res, but a Hp bane is a close second.

One of the many Fury builds I have on Selena. Since pulling an Athena with mediocre IVs when I already have one I'm building, I figured I'd give this pig-tailed tsundere another trick up her sleeve...and tricky it's proven. Combining Fury with her balanced statline and reaching S-rank summoner Support, she proves to be surprisingly useful and proves her claim that she'll be the best in my whole group. Combining how easily she can reach Desperation range with Fury and her overall bulk with the raw power of Quickened Pulse Moonbow, she's an absolute beast once she gets herself going, so the already easy Blazing Blade Tempest Trials are a real breeze with her (gatta date it, can't date her after all). There's not really much else to say here, Reposition is standard for positioning and Threaten Speed ensures more Desperation hits. A relatively generic build capitalizing on what she provides, and even though there are other sword users who do it better, I can't seem to separate myself from this lovably difficult girl.

Selena is one of the most underrated units in the game and with this build she is able to fortify her already good defenses while having a great ofensive,thanks to slaying edge and keeping some of her natural skills which is good to avoid the necessity of grinding for sp.
Selena's atack is pretty bad but with an boon and slaying edge with fury it reaches 46 wich is decent enough and thanks to slaying edge bonfire becomes a 2 turn cd special that adds 17 dmg to her.
Her optimal weapon is Slaying edge but you can opt for wo dao too,however you will have to change her special or give her quickened pulse seal.
For A slot fury's recomended because it helps her generas stats and allow her to become even more tanky.
For slot B you wanna have swordbreaker since she won't be able to outspeed the quicker sword units such as ryoma..
For slot C you can stay with her default or change to any threaten or hone that you want,it is a really flexible slot.
For her assist skill reposition is recomended since it is her default and is one of the best assist skills.
For special you need bonfire to add her dmg output but you can run moonbow if you prefer to use wo dao as her weapon.
Her best seal with this build's speed+1.
Using this build you will be able to unlock the maximum potential of Selena, with 46 atk 39 spd and 35 def allowing her to show that she is much better than people think she is.

Neutral nature.
or +atk -res
Sacred seal = +3Hp

With Fury 3, all of Selena,s stats will be above 30 exept for atk (With attack boon she will reach 32 atk)
With this balanced stat spread, Selena will become an all-rounded character.
However Fury 2 might be chosen if the 6 damage recoil is to much for your taste (which still gives her a respectable stat spread).

Renewal allows Selena to heal lost hp from both enemy attacks and fury.

Wo Dao+ and bonfire offset Selena,s low damage output by giving her an extra 27 damage when Bonfire triggers.

Reposition is a good movement option to get someone out of a sticky situation or bring someone in range of an enemy.

Sacred Seal Hp+3 to add on her overall bulk.

While she won,t greatly excel in anything, she is very flexible in both offense and defence which makes her great for any team.