A common theme is his struggle with the Hyuga clan's traditions. Since the Hyuga clan has strict rules and expectations, many fanfics explore how Akito deals with them. For example, he might be trying to break free from some of the more archaic traditions while still maintaining his loyalty to the clan.
The theme of growth is quite prevalent. Both Akito and Kyo are complex characters, and in fanfictions, they often grow and change as they get closer. Also, the theme of acceptance. They have to accept each other's flaws and past actions in order to move forward in their relationship.
A lot of 'air gear akito fanfic' has the theme of exploration. Akito explores new areas in the air gear world, whether it's undiscovered tracks or secret air gear facilities. This exploration often leads to new challenges and opportunities for him to shine.
In most comic versions, Echo isn't deaf. However, there might be alternate or special story arcs where this could potentially be a trait, but it's not a common characteristic.
Sure, Echo is portrayed as deaf in the comics. This trait plays a role in shaping her personality and the challenges she faces throughout the comic series.