How do you become a mermaid in The Sims 4? If you’re ready to trade your Sim’s legs for a shimmering tail and dive deep into supernatural underwater adventures, there are several tried-and-true paths to mermaidhood in the game. Whether you’re a fan of storytelling, love collecting hidden treasures, or just want to make a splash with Sulani’s most magical life state, becoming a mermaid opens up a whole new world of possibilities — literally and figuratively. Let’s wade into the best ways to turn your Sims into mystical sea-dwellers and explore what makes mermaids in The Sims 4 such an enduring fan favorite.

Creating a Mermaid Sim from the Very Start

Let’s face it: sometimes you don’t want to wait. If you’re starting a new family or telling a Sulani fairytale, you can make a mermaid Sim instantly in Create-a-Sim (CAS). When you’re adding a new Sim, simply click the plus icon and choose to add an Occult. Select “Mermaid,” and your Sim will emerge from the digital sea, ready to customize! You can change their tail color, fin shape, and even their scale markings. It’s as simple as picking a hair color or outfit, and it allows you to design your dream mermaid down to the last detail.

If you prefer building stories from the ground up, you’ll appreciate that only Teens, Young Adults, Adults, and Elders can be made directly as mermaids. Children and toddlers, naturally, are a no-go at CAS — that adds to the magic of discovering their mermaid heritage as they age up.

This method is foolproof and fast, perfect for new games or if you want to try mermaid storytelling without any extra steps. Want to see an example? Check out this full walkthrough of all the customization options in the handy CAS guide from TheGamer.

Mermadic Kelp: The Classic Transformation Quest

If you like your Sims adventures with a dash of discovery, you’ll love transforming a human Sim into a mermaid with the mysterious Mermadic Kelp. This glowing seaweed is the key to unlocking your Sim’s aquatic potential. But how do you find it?

How to Get Mermadic Kelp

  • Diving and Exploring: Send your Sims snorkeling, diving for treasure, or free-diving off Sulani’s breathtaking coasts. Sometimes, Mermadic Kelp is hidden in secret underwater troves — just the thing for Sims with an adventurous streak.
  • Dolphin Gifts: If your Sim has befriended a dolphin (who doesn’t love dolphins?), you might occasionally receive Mermadic Kelp as a token of friendship during treasure hunts. It’s not guaranteed, but it’s a charming possibility.
  • Fishing and Curiosity: Cast your line in Sulani’s deeper waters and who knows? Alongside fish and collectibles, there’s a rare chance to pull up some kelp.
  • Satisfaction Points: Prefer a sure thing? Head to the Rewards Store and you can purchase a chunk of Mermadic Kelp for 500 Satisfaction Points. It’s a fair price for such a powerful treat, and it means all gameplay styles are supported.

For more step-by-step instructions and kelp-hunting ideas, check out guides such as the tutorial from SimsVIP.

Triggering the Transformation

The moment your Sim eats Mermadic Kelp, they’ll receive a unique “Strange Sensations” moodlet. But here’s the key: your Sim needs to swim within 24 in-game hours. If you jump into the ocean, a pool, or any body of swimmable water, their transformation kicks in. You’ll see a dazzling effect and, voilà, your Sim is now part of the aquatic world! If you run out of time or forget to swim, don’t panic — you can always try again by eating another kelp.

Cheat Your Way to the Ocean’s Embrace

Maybe you’re less “raise and nurture” and more “let’s just dive in, already!” If so, cheats are your friend. Here’s how you can become a mermaid instantly or get all the supplies you need:

  • Enable cheats first: On PC, press Ctrl + Shift + C. On Mac, use Command + Shift + C. On consoles, press all four shoulder buttons. Then type testingcheats true and hit Enter.
  • Get kelp fast: Type bb.showhiddenobjects, then head to Build/Buy Mode and search for “Mermadic Kelp.” Place it in your world and have your Sim eat it — just like with the traditional method.
  • Instant transformation: If you want to skip everything, enter traits.equip_trait trait_OccultMermaid in the cheat console. That’s it. Your Sim is now a mermaid, no kelp or swimming required. Great for testing, storytelling, or if life on land is just too boring.

For a full breakdown of all these options, Carl’s Sims 4 Guide has clear, step-by-step instructions that work in any Sims 4 save.

Mermaid Lineage: Letting Genetics Decide

Ever wondered what might happen if a mermaid and a regular Sim fell in love? It’s not just a Sims romance story — it’s one way to create generation after generation of merfolk. Kids born to a mermaid parent have a good chance of inheriting their supernatural abilities, but genetics always keep you guessing. Some children will grow up into mermaids, while others might remain blissfully on land. Think of it like rolling the dice for eye color or traits, but with much splashier results.

This approach adds layers of surprise and depth to legacy families, and is perfect if you want mermaid powers to feel earned or mysterious.

Unleashing Mermaid Powers and Living the Salt Life

Life as a mermaid Sim is nothing short of magical. Once transformed, your Sim gains unique abilities that run on Hydration, not Energy or Hunger. Want to cast a Siren’s Lullaby or summon a mystical dolphin companion? You’ll use up some Hydration Points, which you can restore by swimming or taking a bath.

  • Mermaid’s Kiss can improve relationships or even save a Sim from drowning.
  • Summon Thunderstorm, Clear Skies, or Call Rain let mermaids control Sulani’s tropical weather—something landlocked Sims can only dream about.
  • Aquatic Lure increases fishing luck, perfect for collectors or ocean conservationists.
  • Siren’s Lullaby, Summon Ocean Threat and other powers have unique emotional and gameplay effects on other Sims.

And don’t worry, mermaids pass as ordinary Sims on land, with no impact on careers or relationships outside of water. But once they’re swimming, their tails shimmer and all eyes are on your aquatic superstar. For an overview of unique gameplay and powers, Gamerant’s mermaid guide breaks down every ability and effect in detail.

Diving Deeper: Stories, Careers, and Creative Play

Transforming into a mermaid isn’t just about a sparkly new tail — it opens up tons of new storytelling and career options. Many players love combining mermaid Sims with the Conservationist career, taking on ocean cleanups, wildlife rescues, or even eco-minded beach parties. Others go in a different direction and turn their Sim into a romantic siren, charming the locals and living out their own enchanted “Splash” fantasy.

Whether you treat mermaiding as a casual side story or the heart of your Sulani saga, you’ll find that replay value is sky-high. Your Sim’s powers, looks, and even their hybrids (mermaid-vampire babies, anyone?) are completely customizable.

If you’re curious about advanced gameplay ideas, Sims Community’s comprehensive article is packed with inspiration.

Frequently Asked Questions About Becoming a Mermaid in The Sims 4

Can children or toddlers become mermaids?

Children and toddlers can only be born with mermaid potential if they have a mermaid parent. However, their skills remain dormant until they age up to Teens, at which point the tail finally appears! They cannot be made as mermaids in Create-a-Sim or by eating Mermadic Kelp as kids.

Is it possible to stop being a mermaid once transformed?

Yes! If you ever want your Sim to return to life on land, find and eat two more pieces of Mermadic Kelp in a row. Alternatively, cheats can be used to remove the mermaid trait. This process is completely safe — no need to worry about “side effects” or lost skills.

Can I customize a mermaid’s tail and look?

Absolutely. Just like with hair or eye color, you can choose tail color, fin design, and even add scale patterns to the torso and face. These features are unlocked in Create-a-Sim once your Sim becomes a mermaid. Play around until you nail that perfect undersea look!

What happens if my Sim doesn’t swim after eating Mermadic Kelp?

If your Sim fails to swim within 24 hours, the “Strange Sensations” moodlet fades and the kelp’s power is lost. But that’s not the end of the road — you can simply eat more kelp and try again. Some players actually like using this as a storytelling device, adding a ticking clock to their Sim’s big transformation moment.

Are there any downsides to being a mermaid?

Not really! Mermaids have slightly different needs — hydration replaces hygiene — and some interactions (like cleaning up with water) restore their vital points faster. Mermaids can’t go without water for too long, but otherwise, the game is very flexible and won’t lock you out of key content or jobs. Just remember, you might sometimes get a funny look if you swim in your tail at the local gym pool!

Can mermaids combine with other occult types?

In The Sims 4, Sims can only have one supernatural “Occult” type at a time, so your mermaid Sim can’t simultaneously be a vampire, spellcaster, or alien. The one exception? Offspring of different occult parents might inherit different traits, and there are plenty of mods out there if you’re feeling especially creative.

Ready to Dive In?

Whether you embrace classic kelp discovery, shortcut your way with cheats, or start a multi-generation mermaid dynasty, transforming in The Sims 4 is as flexible as your imagination allows. If you want in-depth, hands-on video coverage, splash into this YouTube guide for more visual tips and tricks.

Curious about specifics? Don’t miss the wealth of expert-written tutorials:

So, grab that kelp, practice your siren song, and dive into one of The Sims 4’s most enchanting supernatural journeys. The ocean’s calling — and your Sims are ready to answer!