Figure that I'd give the Bikini Bottom more Rulers, this time adding in More Water Deities from Foreign Mythologies of Different Cultures in a Group of Seven Sea Gods ruling over Each of The Seven Seas.
From Left to Right; Poseidon (from Greek Mythology), Neptune (from Roman Mythology), Ryūjin (from Japanese Mythology), Mac Lir (from Celtic Mythology), Varuna (from Hindu Mythology), Sobek (from Egypt Mythology), and Njǫrd (from Norse Mythology).
We pretty much already know much about Poseidon/Neptune behind Greco-Roman Mythology. Greek/Roman God of the Seas, Son of Cronus/Saturn and Rhea/Ops, brother of Zeus/Jupiter and Hades/Pluto, Husband of Amphitrite/Salacia, yada, yada, yada, ect. pretty much you Greco-Roman Mythologists out there who have watched SpongeBob and seen Sponge on The Run would defiantly would know who Poseidon/Neptune is. But what about the Water Deities from Different Mythologies? Who are they? Well, here are some personalities for our new guys.
Ryūjin (Japanese Water Deity and Third Ruler of The Seas)
The Master of the Serpents and King of a Sea Dragon. Ryūjin has the ability to take both in Three Forms; A Dragon (his Actual Species), An Anthro Fish (to civilize Fish People like from the Bikini Bottom), and Human (Only for the Surface Land). Ryūjin is a Cunning Wise-Cracking Dragon who's often to take hold of his responsibilities of being King and as well as creating fun for his own. He enjoys to have a slice of life such as eating some Krill or Plankton, he even has the power to make Gemstones glow. Whenever he gets furious or angry, storms would usually come in out of nowhere as he also controls waves to make them very big and crazy like a hurricane.
Voice Actor: John de Lancie (Discord from "My Little Pony: Friendship is Magic")
Mac Lir (Celtic Water Deity and Fourth Ruler of The Seas)
A Wise, Kind, and Noble Deity. Mac Lir is also known as "Manannán", he was a Brave Warrior of a Deity who fights in Wars and is also part of Another Deity Tribe, "Tuatha Dé Danann". Mac Lir is not really all that fearsome of a God but he's often very nice as he protects to those who had a rough life as he is willing to give anyone who deserved something much better a chance. He often rides on Sea Horses throughout the Seas and claims that All Sea Creatures are very good-natured animals.
Voice Actor: Christian Bale
Varuna (Hindu Water Deity and Fifth Ruler of The Seas)
Basically the Hippie Type out of the Group. Varuna is Very Peaceful, Laid-Back, and Enlightened. He is mostly rather Chill but outside of being a Water God, he's also a Ruler of the Sky Realm and even upholder of the Cosmics, known for being a Chief of the Adityas. He can tell and predict the future with his highest knowledge with great power behind a thousand eyes. He sometimes enjoys to visit Parties such as visiting a Festival with the Gods and is very respected by the Fish who he is welcomed to.
Voice Actor: Khary Payton (Rafiki from "The Lion Guard")
Sobek (Egyptian Water Deity and Sixth Ruler of The Seas)
A Lord of Crocodiles and even God of the River Niles. Sobek has the ability to control Waters as well as being in command with a pack of his own Crocodiles. Like Poseidon, he is very Vain and Self-Centered but unlike Neptune's Greek Counterpart, he isn't lazy and is often busy doing his Job protecting the Nile. He can allow his Crocodiles to not eat People for those who fear death unless if you pray for him to make Crocs get out of the Water. He is also able to protect anyone who obeys him from Evil and hate if anyone would dare try to screw his Job of being a King of the Nile Rivers, usually he gets pissed at that when someone tries to mess things up around him.
Voice Actor: Kevin Hart
Njǫrd (Norse Water Deity and Seventh Ruler of The Seas)
Njord is very stoic at nature. Like Neptune, he is very regal to control both the Waters and is able to give people who obey him the riches with Great Wealth. Needless to say, he is often very mature and tends to focus on his responsibilities of being King such as doing the Royal Stuff, he is soft-spoken and gentle. He would punish others who are Evil such as the Monsters around from the Sea. He doesn't necessary like people who are greedy or selfish as he is willing to pay them with Karma such as an Important Moral Lesson; If they want great wealth, they must learn to be a better and respectful person without being selfish and Greed at heart, only use Charity at Heart. He is very faithful and respectful towards anyone, even to those like his Wife, Skadi (The Goddess of Winter).
Voice Actor: Billy Zane (John Rolfe from "Pocahontas II: Journey to a New World")
I made each of the Men-like Water Gods (except for Ryūjin and Sobek) into Merman like how the show does with Neptune and Poseidon because since some Gods have Titles of being in charge of Waters, wouldn't they also be depicted as Merman too?
Also, I should be such further noticed that I don't really consider the Other Neptune from the First Movie part of the Rulers of the Seven Seas. In my AU, he's just a King of Merpeople, not a God since Most Gods don't generally wear Royal Medieval Outfits.
Also, for the Backgrounds that I used behind these versions of the Other Foreign Gods, I just googled up each Foreign Waterland/Ocean/Sea to resemble what Country that they are from. I do NOT own these backgrounds, credit goes to each of the Backgrounds that I have found for Google.
SpongeBob SquarePants (c) Stephen Hillenburg
Water Deities (c) Mythology