Which Blessing should i give to my Ayra and my Nowi and possible Skill Improvements

I was thinking of upgrading them with a blessing cause this two is what i usually main as and want them to be more stronger and also possible improvements like Skill and Such to give to them

Ayra
Stats w/o weapon and skills
HP - 49
ATK - 35
SPD - 39
DEF - 33
RES - 20

A Skill - Swift Sparrow 2
B Skill - Desperation 3
C Skill - Threaten Speed 3
S Skill - Close Def 3

Weapon - Ayra's Blade
Support - Reposition
Special - Regnal Astra

She also Has a Summoner Support

Nowi +1 Merge
Stats w/o weapon and skills
HP - 43
ATK - 38
SPD - 27
DEF - 30
RES - 27

A Skill - Fury 3
B Skill - Quick Riposte 3
C Skill - Threaten Res 3
S Skill - Heavy Blade 3

Weapon - Lightning Breath+ (DEF)
Support - Reposition
Special - Aether