The Giga Mermaid is the second boss that appears in Half Genie Hero. She is the Queen of the Mermaids.
Boss Fight & Strategy
Shantae must destroy the locks connected to the chains holding the Giga Mermaid. Once freed, she fires lasers at Shantae who must attack her in the head many times. Using spitfire during the second phase is benefitial to the player, dealing more damage in a shorter amount of time.
Giga Mermaid's attacks have been modified to increase difficulty. In her first phase the large energy orb and small, multiple energy orbs that may be fire has had their speed increased. Her lightning attack will now instead strike the top-left / top-right of the stage and will travel in the opposite direction around the stage (counter-clockwise if top-left, clockwise if top-right).
In her second phase her lightning strikes will attack more quickly and the hook/platform stage will be risen from the ground for a shorter amount of time.
Giga Mermaid is initially hostile while under mind control and struggles to free herself. However, immediately after Shantae destroys the locks keeping her, the freed Giga Mermaid attacks Shantae. After another short battle with the half-genie, she quickly calms down as her gem and eyes become blue instead of red and smiles.