I've totally realized that Aquila has few companions. That is, compared to amounts like Skull Island and MooShu's companions. So I decided to make my very own decision for KingsIsle.
After you've completed half of Aquila, you can buy the Aquila Companion Family from the Crown Shop.

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Alfredo Burn
Level () Vulture Pirate
He starts off with:
Cheap Shot
Vengeance Strike
Blade Storm

Later, you customize it with:
Cheap Shot X2
Relentless
Notes: He also has Pirate. He is a Swashbuckler.
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Commander Sscutlo Manu
Level () Ophidian Commander
He starts off with:
Turn the Tide X2
Hold the Line

Later, you customize it with:
Blade Storm
First Strike
Notes: He is a Buccaneer.
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Reepa Arius
Level () Eagle Archer
She starts off with:
Parting Shot
Double Tap
Overwatch X2

Later, you customize it with:
Parting Shot X2
Witch Hunter
Notes: She is a Musketeer.
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Carmus Tenebris
Level () Eagle Shade
He starts off with:
Turn the Tide
Hold the Line X2
Blade Storm

Later, you can customize it with:
Repel Boarders
Flanking
Notes: He is a Witchdoctor, but uses melee abilities like the Buccaneer Eagle Shade enemies.

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Vocalus Volatus
Level () Spartan Guard
He starts off with:
Flanking X2
Blade Storm
Vengeance Strike

Later, you can customize it with:
Relentless
Notes: Despite having a few Buccaneer abilities, he is a Privateer.
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I hope KingsIsle enjoys the concept for my Aquila companions. Maybe they might add an expansion for them!

Mark Laveer, Buccaneer