[@Hael] I quite like the schizophrenia going on there, really playing on nature's ability to heal and destroy. Of course, it won't give the mortals being swept up by the Kraken any consolation to know that their sea god is just half mad and doesn't really mean to destroy everything in his wake xD great way to explain natural disasters too, I can just imagine xP

As for sea life coming under Oceans, I would say that having the portfolio of Sea/Ocean does give Undasis greater power over sea life, as they are technically part of the sea. However, they are still life-forms and any god can create them, but they come under Undasis' domain. If you do want to increase his power over sea life in future, you can always add them as a portfolio.