The first soulmates
Jaya:Nya and jay are soulmates and because of that when they first met they basically formed a strong soulmate bond that cannot be broken and it's unbreakable so yeah they fell madly in love with each when they met and because she is a reincarnation the universe decided to make them soulmates and because of that they care about each other so much and no one can separate them and Jay is super overprotective with Nya because he knows that she is a reincarnation and so does the rest of the team
And in this once Nya merged with the ocean she can switch between her human form and water based form spoiler
Jays age 17
Jay is also a reincarnation and he was her childhood best friend in their past life and they were in love with each other and since he was reborn as Jay he basically became Jay but different
Like Nya since she was reincarnated as Nya and she was reborn and she basically became Nya but different
Since Jay and Nya have been childhood best friends since they were born They actually still remember each other even after being reborn and also because they were both childhood lovers but they never confessed their feelings for each other and the god who reincarnated them as Jay and Nya he wanted them to remember each other even after they were reborn I hope that makes sense