When Finn rides the Royal Seahorse over a massive wave when he enters the Water Kingdom he is put on trial and then sentenced to death but the Water Princess loves him and saves him. They both date after that. Water Princess is madly in love with Finn but Finn does not feel the same way she loves him. Finn doesn't tell her he likes the Flame Princess because he is aware of her rivalry. In her latest appearance the water Princess says she doesn't like Finn as much as she did before due to his romance with the Fire Princess but she then states she likes him a bit due to his cuteness.