Ava was a Southern hatchling, and a member of the Mako Pod. She was close friends with Amaris, Jewel, and Naia, and the four attended the Mermaid School together in the pod.
As a mermaid, Ava possessed the ability to speed-swim, was protected from the cold and water pressure of the sea, and was capable of holding her breath for at least fifteen minutes.
She did not develop all of her mermaid powers yet, and attended the Mermaid School to learn how to master her powers, before presumably graduating.
Moon Spell Control: An essential skill that every merperson had to learn to master properly, as it let them survive the Full Moon's spell without letting it bewitch and control them. As a hatchling back in the mid-2010s, Ava presumably learned the Moon Spell Control during her time at a Mermaid School, together with her fellow mermaid friends, Amaris, Jewel, and Naia.
Limited Transformation: After falling under the Legs Spell cast by Ondina during her time at a Mermaid School, Ava possessed the ability to grow legs when dry, and temporarily turn into a human, along with all the clothing and accessories she was wearing before she returned to her true mermaid form. However, once only a drop of water made a physical contact with her skin, she reverted back into her true mermaid self, and was unable to remain on a dry land for long periods of time without eventually dehydrating, and ultimately dying as a result of her frailing condition, and needed to take regular swimming sessions in order to remain physically healthy. She was also likely able to utilize her mermaid powers while under her human form, including Invisibility.
Speed-Swimming: The ability to scwim at an incredible speed, and as such, their bodies was encased in bubbles because of the incredible high speed. As mermaid, Ava possessed the ability to swim at a super speed, and dive at depths no human being was capable of, completely protected from its cold and water pressure.
Enhanced Breath: Merpeople were able to hold their breath without any discomfort for at least fifteen minutes before needing to breathe, and would get unconscious if the time period extended over past those minute. She was also capable of holding her breath for at least fifteen minutes.
Enhanced Senses: Merpeople might have slightly enhanced senses suited to life underwater due to living in the sea.
Aquatic Adaptation: Depending on where they were born and raised, merpeople may be resistant to certain elements in that area.
Thermal Resistance: The ability to survive extreme hot or cold temperatures.
Endurance: Merpeople are able to swim for days without exhaustion, something which no human has the stamina to do. They were also able to dive at depths no human could withstand.
Amphibious: Merpeople's respiratory system can extract oxygen from both water and air, allowing them to breathe freely both underwater and on land.
Extended Lifespan: While merpeople do age, their lifespan was far longer than that of humans, and they aged at a much slower rate.
Her Moon Ring: Presumably after graduating from the Mermaid School, Ava received her own Moon Ring as part of her initiation in the pod.
Weaknesses[]
Ava possessed all the typical weaknesses of a natural-born Southern mermaid. However, she was still linked to Mako Island's Moon Pool's continued existence and well-being, meaning if it was ever to be destroyed or deprived of its powerful, magical Moon Water, she would perish and die with it if the destruction of her source of magic was not resolved in time.
Name[]
In the Surmiran dialect of the Romansh language, Ava means "water". In Samoan, it is a noun that means "passage through a coral reef for boats".
Trivia[]
She had legs in one episode of season 3, like the rest of her friends.
She was the youngest of her friends.
Ava was the second youngest known hatchling ever in H₂O/Mako Mermaids Universe, following Isabella Hartley, who underwent her metamorphosis at the age of 9 in the late 1990s.[1][2] Ava, however, was born in the coral reef surrounding Mako Island and therefore a sea-born mermaid, whereas Bella was born as regular girl in an unspecified country and by other hand, a transformed mermaid.