Tenna’s Forgotten Origins in Deltarune

Toby Fox, the visionary behind Undertale and Deltarune, has a history of innovative character design that blends whimsy with depth. One standout creation is Tenna, the charismatic CRT television-headed antagonist from Deltarune’s later chapters. Surprisingly, this beloved villain first took shape almost a decade ago, during Fox’s early experiments with 3D modeling and motion capture. What began as ambitious prototypes evolved through trial and error into the memorable figure fans adore today.

The Spark of Creation: A Character Born in 2016

In 2016, Toby Fox was diving into 3D animation, a departure from his 2D roots in Undertale. Tenna emerged during this period as a concept for a dynamic TV-headed game show host. Fox shared on social media that he purchased an Xbox Kinect specifically to rotoscope movements for this character, aiming to capture fluid animations. Rotoscoping involves tracing over real-life footage frame by frame, a technique popularized in animation to achieve realistic motion.

The character’s design drew inspiration from retro CRT televisions, evoking nostalgia for old-school game shows and broadcasts. Fox envisioned Tenna as a larger-than-life personality, complete with exaggerated gestures and dances. However, these initial efforts quickly hit roadblocks, leading to several abandoned ideas that highlight the challenges of indie game development.

Experimental Tech: Kinect and Motion Capture Dreams

The Xbox Kinect, originally a motion-sensing accessory for the Xbox 360 launched in 2010, became Fox’s tool of choice for prototyping Tenna. Kinect uses infrared sensors and cameras to track body movements without controllers, making it ideal for DIY motion capture. Fox aimed to use it to record his own dances and animations, directly mapping them onto Tenna’s 3D model.

• Kinect Setup Challenges: Setting up the device required precise calibration in a spacious area, free from obstructions.
• Rotoscoping Process: Fox would perform motions, then import the skeletal data into 3D software for refinement.
• Intended Outcome: Smooth, lifelike dances that would make Tenna pop in Deltarune’s Dark World.

Despite the potential, Fox abandoned this approach early, citing poor results. The captured motions felt janky, and integrating them with his pixel-art style proved mismatched. This pivot underscores a key lesson in game dev: sometimes, simplicity trumps cutting-edge tech.

Dancing with MikuMikuDance: Anime-Inspired Ambitions

Another scrapped idea involved MikuMikuDance (MMD), a free program for animating Vocaloid characters like Hatsune Miku. MMD allows users to apply pre-made dance motions to 3D models, creating viral anime-style videos. Fox planned to import Tenna into MMD, choreographing sequences with these motions to give the character infectious energy.

Imagine Tenna busting out synchronized J-pop dances amid Deltarune’s quirky battles— a fusion of Undertale’s bullet-hell combat and Vocaloid flair. Fox experimented with this in 2016, blending Kinect data with MMD libraries. Yet, the results were “tremendously bad,” as he later reflected, due to stylistic clashes and technical limitations.

From 3D Prototypes to 2D Mastery

Fox initially modeled Tenna in a lineless 3D style, reminiscent of Ghost Trick: Phantom Detective‘s clean, puzzle-game aesthetics. He rendered prototypes himself but deemed them unsatisfactory. By Deltarune’s release, Tenna appeared in polished 2D sprite art, with select 3D elements handled by collaborators. This shift preserved Fox’s signature pixel perfection while incorporating subtle 3D flair in key scenes.

Deltarune, an episodic RPG set in a parallel universe to Undertale, follows Kris, Susie, and Ralsei through Light and Dark Worlds. Tenna debuts in Chapter 3 as a TV station boss, hosting deadly game shows that test the party’s wits and reflexes. His design cleverly ties into themes of media manipulation and nostalgia, making him a fan favorite.

Toby Fox’s Development Philosophy

Fox’s journey with Tenna exemplifies his iterative process. Starting from a 2011 fever dream that birthed Deltarune, he balances bold experimentation with ruthless pruning. Interviews reveal he often prototypes wild ideas—like motion-captured dances—only to refine them for accessibility. This approach has defined his games’ charm: humor, heart, and hidden depths.

In a 2025 look-back on Chapters 3 and 4, Fox reminisced about the Kinect-MMD combo, calling it a “crazy dancing 3D TV character” experiment. Though shelved, these efforts influenced Tenna’s final animations, which retain a rhythmic, performative quality.

Tenna’s Role in Deltarune’s Narrative

In-game, Tenna rules a television-themed Dark World, broadcasting challenges laced with Undertale-esque mercy options. Players can pacifist through his shows or go full aggression, altering outcomes. His CRT head glitches with emotions, symbolizing fractured realities—a motif echoing Deltarune’s prophecy-driven plot.

Fans speculate Tenna’s longevity stems from these scrapped roots; his static-y dances nod to abandoned MMD dreams without overt 3D. Community tracks, like fan-made dance battles, keep the spirit alive.

Evolution of Deltarune Chapters

1. Chapter 1 (2018): Introduced core mechanics and Kris’s world.
2. Chapter 2 (2021): Expanded Dark Worlds with Spamton echoes.
3. Chapters 3-4 (2025): Brought Tenna and TV horror, fulfilling early promises.

Each chapter builds on Fox’s prototypes, turning personal experiments into communal experiences.

Impact on Indie Game Design

Tenna’s story inspires indies to embrace failure. Tools like Kinect and MMD democratized 3D, yet Fox proves 2D’s enduring power. His transparency via social media fosters community, turning dev logs into lore.

FAQs

What is Tenna in Deltarune?

Tenna is a CRT TV-headed game show host and antagonist in Deltarune Chapters 3 and 4, known for quirky battles and media-themed puzzles.

Why did Toby Fox abandon 3D for Tenna?

Prototypes looked poor, and 2D better fit Deltarune’s style.

Did Toby Fox use Kinect for Deltarune?

Yes, in 2016 for Tenna’s motion capture, but scrapped it.

What’s MikuMikuDance?

A free tool for Vocaloid animations, eyed by Fox for Tenna’s dances.

Is Deltarune connected to Undertale?

It’s a parallel universe with shared themes and characters.

Community and Fan Legacy

Tenna has sparked art, music, and theories. Fan tracks remix his motifs into dance fights, echoing Fox’s visions. As Deltarune continues, expect more evolutions from Fox’s vault.