The Zakana is a hybrid support unit with high weapon fire speed. Without any upgrades, the Zakana is merely a fast firing unit. The Team Vigor upgrade allows the Zakana to take on a support role by boosting attack power of nearby units. Although it's damage output is low compared to other units, the Amplifier and Shield Disruptor upgrades help boost the Zakana's effectiveness. The only caveat is that the Zakana only has a base health value of only 19HP, so that it can easily be destroyed.
Team Vigor - Provides a small attack power boost to all units in range
Shield Disruptor - Grants weapon shots a chance to destroy enemy shields
Amplifier - Greatly boosts attack power