touched by the sea https://www.d20pfsrd.com/traits/campaign-traits/skull-shackles/touched-by-the-sea/

elemental bloodline aquatic bloodline

gnome
pyromaniac (+1 fire) tattooed sorcered (+1 evoc) spell specialization (+2 selected)

aquatic druid https://www.d20pfsrd.com/classes/core-classes/druid/archetypes/paizo-druid-archetypes/aquatic-druid

shark shaman https://www.d20pfsrd.com/classes/core-classes/druid/archetypes/paizo-druid-archetypes/shark-shaman

aquatic domain