7 Shocking Facts About Indigo Keen: The 'Lunatic Indigo' Mermaid Princess From Rainbow Bubblegem

The world of magical girl anime has a new, complex star, and her name is Indigo Keen. As of late 2024 and early 2025, the buzz surrounding the Chinese-Korean animated series Rainbow Bubblegem (레인보우 버블젬) has reached a fever pitch, largely due to its main cast of powerful, jewel-themed heroines. Indigo Keen, in particular, stands out among the Seven Mermaid Princesses, not just for her striking dark-skinned design and indigo color scheme, but for a personality that is anything but typical for the genre. Her dual identity as the serene Princess Indigo and the formidable "Lunatic Indigo" has captured the curiosity of fans worldwide, especially as the series expands its international reach and introduces fresh plot twists.

This article dives deep into the lore, character profile, and the most recent updates surrounding Indigo Keen, based on the latest information from the ongoing animated series. From her mysterious lineage to her unique magical abilities, we break down the essential facts every fan needs to know about the tetartagonist of the hit show, which has seen recent distribution updates across Asia, including its 2024 debut on Mentari TV in Indonesia.

Indigo Keen: Character Biography and Profile

Indigo Keen is a central figure in the Rainbow Bubblegem franchise, a series that blends the popular magical girl (Mahou Shoujo) genre with mermaid fiction. Her role is crucial, as she is one of the protectors chosen by the entity Whitegold from birth.

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• Full Name: Indigo Keen (인디고 킨, 青菌)
• Aliases: Princess Indigo, "Lunatic Indigo" (Magical Girl Form)
• Role: One of the Seven Mermaid Princesses
• Series Debut: Purple King's Visit (RBG episode)
• Affiliation: Seven Mermaid Princesses, Royal Family of the Indigo Realm
• Family: Daughter of the posthumous Indigo Queen (original ruler of the Indigo Realm)
• Appearance: Characterized by dark skin and dark blue eyes, with an indigo color scheme in both her mermaid and magical girl forms.
• Classification: Main Protagonist / Tetartagonist

The Dual Identity: Princess Indigo vs. Lunatic Indigo

One of the most compelling aspects of Indigo Keen’s character is the contrast between her royal persona and her magical alter-ego. While the other princesses, such as Purple Star ("Twinkle Purple"), often have bright, cheerful magical names, Indigo's is notably darker, hinting at a hidden complexity.

A Cold Exterior, A Warm Heart. Indigo's personality is often described as cold on the outside, a trait that sets her apart from her more outwardly enthusiastic peers. However, this aloofness is a shield, revealing a more complex and sensitive inner self as the series progresses. This internal conflict and depth have made her a favorite among fans who appreciate nuanced character development in the magical girl genre.

The 'Lunatic' Transformation. Her magical girl name, "Lunatic Indigo," is a clear nod to her powerful and perhaps less predictable nature when transformed. She is one of the few princesses whose full solo transformation sequence has been featured multiple times, indicating her importance to the storyline and the visual spectacle of the show.

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The Latest Updates on Indigo Keen's Magical Powers and Story Arc (2024/2025)

The Rainbow Bubblegem series, created by Campfire Aniworks, EBS, Tencent Video, and Live Fun, has been consistent in providing fresh content, with mentions of Season 2 updates and new power-ups circulating in 2024.

1. Her Unique Shadow-Morphing Abilities

Unlike traditional elemental powers often seen in magical girl shows, Indigo Keen possesses unique and visually distinct abilities. She is shown to be able to morph into a shadowy blob, a power that speaks to her "Lunatic" title and her connection to darker, more mysterious magic. Her main weapon of choice in her transformed state is a magic wand, which she uses to channel her attacks.

2. The New Bubble Gem Power-Up

A major development in the recent storyline involves the creation of a "new bubble gem" specifically for Indigo Keen. The entire premise of the show revolves around the princesses searching for enchanted jewels, the Bubble Gems, to protect their kingdom. The introduction of a newly created gem for Indigo suggests a significant power upgrade or an evolution in her magical identity, likely tied to overcoming a major challenge in the Season 2 arc.

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3. The Posthumous Indigo Queen's Influence

The history of the Indigo Realm and her mother, the Indigo Queen, continues to be a driving force in Indigo's personal journey. The Queen is a posthumous character, meaning her influence is felt through her legacy and the challenges she left behind. Exploring this lineage allows the show to delve into themes of inherited responsibility and the pressure of royalty, adding a layer of depth to Indigo's otherwise guarded personality.

4. The 2025 "Remastered" Design

Fan art and community discussions, including a 2025 post on DeviantArt, point to a "remastered" or redesigned look for Indigo Keen and the other mermaid princesses. While often driven by fan speculation and art, these "remastered" looks reflect the character's popularity and the continuous evolution of the show's aesthetic, keeping the franchise fresh and engaging for its global audience.

Topical Authority: Rainbow Bubblegem's Place in Magical Girl Anime

Rainbow Bubblegem is a significant entry into the modern magical girl landscape, drawing comparisons to classics like Mermaid Melody Pichi Pichi Pitch due to the mermaid princess theme, but with a unique Korean-Chinese animation style and modern sensibilities.

The series' success lies in its ability to balance lighthearted school-life adventures—as the seven mermaid princesses attend school on land to find the magical jewels—with high-stakes magical battles. The show's production by major entities like Tencent Video and the recent 2024 distribution updates across Southeast Asia, such as its Indonesian premiere, confirm its status as a major international animated property.

Indigo Keen, with her complex personality, unique shadow powers, and compelling backstory involving the Indigo Queen, embodies the show's move toward more sophisticated character writing. Her journey, particularly the recent development with the new bubble gem, is a key reason why fans are eagerly awaiting further episodes and the full unfolding of the Season 2 storyline.

The ongoing narrative promises more exploration into the dynamic between the Seven Mermaid Princesses and their mission to protect their underwater and surface worlds. As the tetartagonist, Indigo Keen's future transformations and the full extent of her "Lunatic Indigo" powers remain one of the most exciting mysteries for fans of the Rainbow Bubblegem series.