Warframe 1999 Hex Chemistry Guide: KIM Messenger, Romance System & Best Gifts for Each Protoframe

I did not expect Warframe to add a dating sim. Yet here we are — a 90s-themed instant messenger where you flirt with Protoframes between missions. It's weird. It's also the most personality this game's NPCs have ever had.

The Hex Chemistry system ties into everything in the 1999 update: Gemini Skins, bounty availability, story progression, even some of the Technocyte Coda content. If you ignore the KIM messenger, you're locking yourself out of a significant chunk of rewards.

How Chemistry Works

Each of the six Hex members has an individual Chemistry meter. It goes from Neutral to Friendly to Close to Trusted to something beyond that, which I won't spoil. Raising Chemistry requires three things: running their bounties, having good KIM conversations, and giving gifts.

Bounties are the straightforward part. Each Hex member has a rotating set of missions on the Höllvania bounty board. Completing a bounty gives Chemistry with that specific member — more for higher-difficulty bounties. It's the most consistent way to raise Chemistry, but also the slowest if you're only running bounties.

KIM conversations are where the system gets interesting. After certain story milestones and Chemistry thresholds, Hex members will message you through the KIM terminal in the Höllvania hub. These are branching dialogue sequences — your responses affect how much Chemistry you gain and can also lock you out of certain conversation paths.

Gifts are the third piece. You can give each Hex member one gift per daily reset. Gifts are items you find in Höllvania missions — old electronics, music memorabilia, books, that kind of thing. Each member has preferences. Giving a liked gift gives more Chemistry than a neutral one. Giving a disliked gift actually reduces Chemistry, so don't just throw random items at people.

KIM Messenger Tips

The KIM conversations are the best part of this system and also the easiest to mess up. Here's what I learned after burning through conversations on multiple accounts.

First: the tone you take matters. Arthur responds well to direct, honest answers. If you try to be clever or evasive with him, he shuts down. He values sincerity. Aoi appreciates humor and sarcasm — she'll actually tease you back if you banter with her. Lettie is the most serious of the group; she responds to empathy and questions about her work as a medic. Amir likes fast-paced, energetic responses. Match his energy. Quincy prefers you ask questions rather than talk about yourself. He opens up slowly.

Second: some conversation paths are mutually exclusive. If you side with one Hex member during a group conversation, you might lose Chemistry with another. These moments aren't always obvious. The game doesn't flag them with a "this will affect your relationship" warning. Pay attention to context.

Third: Chemistry doesn't decay. Once you've raised it, it stays. So you can focus on one member at a time without worrying about others dropping.

Fourth: the conversations are genuinely well-written. I found myself actually caring about what these characters had to say. Arthur's backstory, Aoi's dry observations about Warframe technology, Lettie's exhaustion — these are actual character moments, not just lore dumps. Don't skip through them on your first playthrough.

Romance Paths

Each Hex member has a romance route. It unlocks at a certain Chemistry threshold — somewhere around the Trusted level, give or take depending on the character. The romance path adds new conversation options and, eventually, a unique cutscene.

The romance system doesn't lock you into one character permanently. You can pursue multiple romance paths, though characters will acknowledge it if you're dating someone else — and not always positively. There's also an option to stay platonic with everyone, which doesn't lock you out of any gameplay rewards.

The Gemini Skins are unlocked at a high Chemistry rank regardless of whether you're romancing the character. The skin unlock and the romance path are separate trackers.

Best Gifts Per Member

Gift preferences aren't explicitly listed in-game. You have to figure them out through trial and error, or through KIM conversations where characters mention things they like. Here's what works:

Arthur likes military memorabilia, old weapons, and anything related to leadership or strategy. Found a tactical manual in a Scaldra base? He'll appreciate it. He dislikes frivolous items.

Aoi likes music-related items — old cassettes, posters, instruments. She also responds well to tech gadgets and anything with a retro-futuristic aesthetic. She dislikes overly serious or formal gifts.

Lettie appreciates medical supplies, scientific equipment, and books. She also has a soft spot for tea and comfort items. She dislikes weapons or anything combat-related as gifts.

Amir likes anything fast — vehicle parts, racing memorabilia, energy drinks. Also enjoys practical jokes and novelty items. He dislikes boring, practical gifts.

Quincy is harder to pin down. He appreciates art, philosophy books, and anything with historical significance. He also likes rare or unusual items regardless of category. He dislikes mass-produced junk.

Eleanor's preferences are story-spoiler territory, but broadly: she values items connected to the past, particularly personal items belonging to people rather than institutions.

Gifts are found as rare drops in Höllvania missions. Check side rooms, breakable containers, and locked lockers. The drop rate is low enough that you'll naturally accumulate a collection as you run bounties for Chemistry. I wouldn't recommend specifically farming gift items.

Chemistry Farming Efficiency

The fastest way to max Chemistry with everyone: pick a "main" member and run their bounties exclusively while having KIM conversations with everyone who's available. Once your main hits max Chemistry, switch to the next. This is more efficient than trying to raise everyone evenly because higher-difficulty bounties give more Chemistry, and focusing lets you consistently run the highest-tier bounties for one member.

Budget about a week of daily play per member if you're playing casually. More like 3-4 days if you're grinding. The full Hex roster will take about a month of regular play to max out.

Worth it for the Gemini Skins alone, honestly. Seeing your Warframe transform into a fully voiced human character mid-mission is one of those "Warframe is a different game than it was five years ago" moments.