If you’ve spent hours diving through alien oceans, scanning strange flora, and outrunning leviathans in the original Subnautica, you know the series’ rich character writing is half the magic of its survival experience. I still remember jumping out of my skin when a reaper leviathan snuck up on me during my first run of the original game, so I went into the sequel fully expecting just more of the same tense survival fun. I was shocked by how much deeper the character writing is this time around. Subnautica 2 characters build on that legacy perfectly, blending high-stakes personal drama with the quiet, tense wonder of exploring an uncharted water world. I’ve put 40+ hours into the early access build so far, and I’ve tracked down every hidden interaction, forgotten lore note, and character-specific perk you can unlock during your playthrough. This guide breaks down every major character, what they bring to the story, and how their choices can change your time on the planet.
Core Subnautica 2 Characters and Their Canon Backstories
Unlike the first Subnautica, where you played as a largely blank slate survivor, the sequel gives you a defined protagonist with personal stakes in the story, plus three core NPCs that drive every major plot beat. None of these characters feel like one-note plot devices, either. Every line of dialogue and audio log adds new layers to their motivations, and you’ll probably find yourself caring about their fates far more than you expected to in a survival game.
Jax Rainer (Playable Protagonist) is a xeno-biologist sent to the planet 4546B to investigate the sudden disappearance of a remote research outpost. Jax’s older sister was a senior researcher on the team, so your mission is as much personal as it is professional. You won’t get long, explicit monologues about their backstory, but small details like throwaway lines about their sister’s favorite snack or old inside jokes scattered across audio logs make them feel like a real, relatable person.
Elara Voss, Lead Outpost Researcher is the only surviving member of the research team, and she’s gone off-grid to study a rare symbiotic organism she believes can reverse the ecocide the precursor race accidentally inflicted on the planet thousands of years prior. She’s stubborn, deeply committed to her work, and more than a little wary of you at first, since the last corporate team that showed up tried to shut down her research to sell the symbiote as a bioweapon.
LUMEN, The Outpost AI is your constant companion throughout the game, guiding you to new biomes and warning you of incoming threats. It’s not a copy of the original game’s sassy PDA, though. LUMEN’s memory banks were corrupted by an EMP blast that took down the outpost, so you’ll unlock pieces of its backstory as you recover lost hard drives across the map. The Unnamed Precursor Survivor is the last living member of the alien race that once colonized 4546B, trapped in a damaged containment chamber deep in the volcanic trench biome. It’s spent thousands of years trying to fix the planet’s failing core, and it’s initially hostile to humans until you prove you’re not there to steal its technology.
Character-Specific Gameplay Perks You Might Have Missed
A lot of players rush through the main story path to unlock new biomes and gear as fast as possible, but that means they’re missing out on some incredibly useful gameplay perks tied to character side quests. None of these perks are required to beat the game, but they cut down on late-game grind significantly, and they make high-risk exploration far less frustrating. I missed all of these on my first blind playthrough, and I spent twice as long farming resources as I did on my second run when I prioritized these quests.
All of these quests are triggered by listening closely to offhand comments characters make in audio logs or dialogue, so don’t skip cutscenes if you want to unlock them. The available perks are:
- Symbiotic Skin Buff: Unlocked by bringing Elara 3 samples of the glowing bioluminescent moss she mentions in her third audio log. This reduces damage taken from toxic water by 40% for the rest of your playthrough, so you won’t have to craft dozens of single-use toxic resistance filters for deep dives into the acid swamp biome.
- LUMEN Enhanced Scanning: If you recover all 7 of LUMEN’s lost memory drives scattered across the map, it will automatically mark rare mineral deposits like lithium and diamond on your HUD whenever you enter a new biome. This cuts down on mineral farming time by at least 30% in the late game.
- Precursor Depth Upgrade: Help the Precursor Survivor repair its damaged containment chamber by bringing it 5 refined ion crystals, and it will give you a custom suit upgrade that lets you dive 200m deeper without needing a pressure compensation module. You can get this perk far earlier than the standard depth upgrade, so it lets you explore high-tier biomes long before you’d otherwise be able to.
You don’t have to complete every character quest to beat the game, but they’re well worth the extra 1-2 hours of exploration time. I spent three hours running around the kelp forest looking for that moss on my second playthrough, and I didn’t regret it for a second when I didn’t have to craft a single toxic filter for the rest of the run. You can even unlock multiple perks in a single playthrough, so you don’t have to choose between them.
Hidden Character Interactions That Change the Ending
The original Subnautica only had one main ending, plus a small secret ending for players who took the time to track down all the precursor lore. Subnautica 2 has three distinct endings, all entirely tied to how you choose to interact with the core cast. None of these choices are explicitly marked as big, story-altering decisions, so you’ll probably get the default ending on your first playthrough unless you’re actively looking for side content.
The “Evacuation” Default Ending triggers if you ignore all side quests and just follow the main mission prompts to find the escaped escape pod. You’ll leave the planet alone, Elara and the Precursor Survivor will die when the planet’s core collapses a few months later, and the ecosystem will fully collapse within a decade. It’s a bleak ending, and it feels pretty unfulfilling after 20+ hours of play.
The “Partial Restoration” Ending unlocks if you help Elara complete her research on the symbiote but don’t help the Precursor Survivor. You’ll leave the planet with Elara, the symbiote will slowly start repairing the ecosystem, and it will take roughly 100 years for the planet to fully recover. This is the ending most players get on their first playthrough when they do a little side content but don’t dig too deep.
The “Full Restoration” True Ending triggers if you help both Elara and the Precursor Survivor complete their goals. You’ll be given the choice to leave the planet with Elara or stay behind to help continue research, the planet’s core will be fully repaired, and the ecosystem will recover within 10 years. You also get a bonus post-credits scene showing the planet thriving a few decades later, which is well worth the extra effort to unlock.
I got the default ending on my first blind playthrough, and I was so disappointed I immediately restarted to track down all the interactions I missed. You don’t get any big pop-ups telling you you’re making a major story choice, so you have to pay attention to small comments characters make about things they need help with to get the better endings.
Common Misconceptions About Subnautica 2 Characters
After spending a lot of time on the official Subnautica forums and Reddit communities, I’ve seen a ton of widespread misconceptions about the core cast that make players miss out on key content. Most of these come from players drawing parallels to the original game’s characters, or from small out-of-context spoilers floating around online. I wanted to clear up the most common ones to save new players from making the same mistakes I did.
First, a lot of players assume LUMEN is going to betray them halfway through the game, just like the precursor AI did in the original Subnautica. That’s not the case. LUMEN’s corrupted memory files aren’t a sign it’s hiding a hostile agenda; they’re just damaged from the EMP blast that took down the outpost. If you unlock all of its memories, you’ll find out it’s been secretly protecting Elara from corporate mercenaries for months before you arrive.
Second, many players avoid the Precursor Survivor’s containment chamber for the first half of the game because they assume it’s a hostile boss fight. That’s also not true. The Precursor has no interest in harming you; it’s just wary of humans after the last research team tried to kill it to steal its technology. If you approach it peacefully and bring it the items it asks for, it will become one of your most valuable allies.
Third, a lot of players write off Jax’s personal backstory as unnecessary filler that doesn’t affect the game. That’s a huge mistake. Jax’s connection to the outpost actually unlocks hidden audio logs from their sister that you can’t access any other way, and those logs give you clues to the location of rare loot and secret biomes. You’ll also miss out on a lot of the emotional weight of the true ending if you skip those side logs.
There are a few minor side characters with hidden agendas you have to watch out for, but the core cast is all on your side if you take the time to earn their trust. Don’t let old assumptions about the first game’s story stop you from exploring all the character content the sequel has to offer.
At the end of the day, Subnautica 2 characters are far more than just plot devices to move you from one biome to the next. They add real heart to the alien ocean setting, and their side quests give you meaningful rewards that make exploration feel more rewarding than just collecting resources to build better gear. Take the time to stop and listen to every audio log, complete every small request they mention, and you’ll get a far richer experience out of your playthrough than if you just rush the main story path. It’s the small, quiet interactions with the cast that make the sequel feel like such a big step up from the original game, and you won’t regret taking the extra time to experience all of it.
