This One's a Doozy, Please Bear with Me!

Okay, the questions I have today is team matchups and how the hell to work them.

I'm currently trying to make a team for each type (Flier, Infantry, Calvary and Armored), and I'm trying to give each gold star I've poured my heart into to make a destructive wrecking ball/impenetrable wall/whatever roll they may need to fill. As such, I'm having issues trying to place teams accordingly without fixing what isn't broken.

So, here's what I have and I hope you all have suggestions! (TBH the only thing I won't do team wise is Split up Arthur and Azura).

Arthur
- Spd, + Def, No Merges
Emerald Axe + (I'm going to replace this with a Slaying Axe, I haven't gotten a chance to do so yet), Reciprocal Aid, Sol
Life and Death 3, Lance Breaker 3, Fortify Defense 3
Drive Defense 1

Azura
+ Atk, - HP, No Merges
Sapphire Lance + (Going to replace this with a Slaying Lance, also have not gotten to it), Sing, Glimmer
Speed + 3, Earth Dance 3, Fortify Res 3
Drive Attack 1

Arden
Neutral IVs, No Merges
Brave Sword +, Pivot, Ignis
Distant Counter, Follow-Up Ring, Drive Def 2
HP +4

Male Morgan
+ Atk, - HP
Grima's Truth, Draw Back, Dragon Fang
Close Counter, Dull Ranged 3, Spur Def/Res 2
Deflect Missile 2

Nephenee
+ Spd, -Res, No Merges
Slaying Lance + Speed, Reciprocal Aid, Glimmer
Distant Counter, Wrath 3, Spur Def 3
Threaten Speed 1

Bridal Charlotte
+ HP, - Spd, No Merges
First Bite + Attack, Smite, Draconic Aura
Death Blow 3, Vantage 3, Threaten Attack 3
Spur Defense 1

Performing Arts Azura
+ Def, - Spd, No Merges
Urðr, Sing, Luna
Triangle Adapt 3, Wings of Mercy 3, Drive Res 3
Fortress Defense 1

Performing Arts Shigure
+ Atk, -Spd, No Merges
Dancer’s Score +, Sing, Luna
HP + 5, Geyser Dance 2, Breath of Life 3
Breath of Life 3

Fallen Takumi
Neutral IVs, No Merges
Skadi, Reciprocal Aid, Vengeance
Fury 3, Renewal 3, Speed Smoke 3
Poison Strike 2

I have a few other units that I've gotten gold on but haven't done anything with and will elaborate on who and what they have as needed. My main question is really - who do you guys think would work well on a team together?