Ok then.
Kol is a tank and does the highest burst single target. It scales into endgame and it has multiple staking abilities, items and synergies.
Akkan is the first support you want. Because Colonization is very pretious for expanding and Inspiring Broadcast is the best AOE buff in the game. And the forth ability can make the difference between loosing or wining, in dangerous situations. For example it can help my ships get very close and snugly to the Ragnarov, without taking damage.
Dunov is an all rounder. It has strike craft, it has some damage, it has abilities that block the Ragnarov or any other ship from using abilities, in an AOE, for up to 30 seconds. It has mass restore shields and energy. It's a small amount but it has a small cooldown.
Sova has its utilities in offense but stronger on defense.
Marza wreaks armies with it's AOE capabilities. Just don't leave its 4 on auto-cast.
The Ragnarov is great if you don't have to spin around to find your target. It's 4th is useless more often than not. And energy is a problem.
The Ankylon is good as long as it's close to the target and has his first turned on so it counter enemy abilities. It's 4th is easily countered by an Level 6 Akkan. Just wait until invulnerability passes 
