Tengen

Tengen, often referred to as Master Tengen is a supporting character in the Jujutsu Kaisen series. They are an immortal jujutsu sorcerer that remains within their chamber, the Tombs of the Star Corridor, at all times in order to reinforce the barriers that protect both Jujutsu High locations.

Master Tengen is also known as the "Star". At one time they were responsible for preaching the foundation of jujutsu sorcerers and ended up spawning religious groups that worship the Star as their deity.

Appearance
Due to the nature of Tengen's role in the jujutsu world, most people have no idea what they look like. Only those granted permission have seen that Tengen does not quite possess the appearance of a typical human being. Tengen has four eyes with a cylinder-shaped head that features no hair at all, but they do possess a bipedal humanoid body. They wear a simple light-colored robe.

As stated by Tengen, due to Toji Fushiguro killing the previous Star Plasma Vessel 11 years ago and preventing Tengen from merging with her, Tengen's current appearance is the result of them having continued to "evolve" past their humanity. Tengen originally possessed a much more human appearance.

Personality
Tengen appears to be a well-mannered, straightforward, and knowledgeable individual with humanity's best interest in mind. They don't seem to mind awkward questions about their experience and is more than happy to help normal jujutsu sorcerers provided the right situation.

Tengen was willing to do all they could to help Yuji and the others stop Kenjaku, but in return asked that two members of his team remain behind to protect them as well. They were stern about this point, but only because Tengen's own safety is the key to humanity's survival.

As shown from the previous mission to protect their Star Plasma Vessel, Tengen also has a softer and kinder side to themselves. This is seen where they ordered Satoru Gojo and Suguru Geto to respect and accommodate Riko Amanai’s wishes and decisions as the time of their merge was fast approaching, even if such desires made their job to protect her more difficult. Hinting that Tengen sympathized with her and was remorseful of the necessity of their condition and the burden it placed on her and wanted to at least respect her final wishes before essentially killing her.

Abilities
Overall Skill Level: Tengen is viewed as an immortal entity and a pillar of security within the jujutsu community, not a fighter, or someone who interacts with the everyday functions of the world. Tengen's abilities are essential to the structure and organization of jujutsu society. They have existed for centuries and are responsible for teaching the foundations of jujutsu that eventually evolved into the modern-day culture surrounding it.

Tengen is the most potent barrier user among all jujutsu sorcerers, even superior to Kenjaku. Tengen created and maintained four pure barriers that improved cursed spirit impression and the barriers cast by Jujutsu High assistant managers. However, Tengen is a non-combat and doesn't use jujutsu for fighting. As far as combat, Kenjaku told his allies to consider Tengen a non-factor. Though it was believed that Tengen could pose a threat to humanity once they evolved and their sense of self diminished, Tengen maintained their self-awareness through force of will and barriers.

Tengen requested strong sorcerers for protection because they are a non-combatant. Even so, Tengen supported the aforementioned sorcerers in battle. Tengen contributed to Yuki and Choso's fight against Kenjaku by manipulating the empty barriers that served as the setting. Tengen, Yuki, and Choso strategized for the encounter beforehand and the former contributed to the actually fight by dispelling their empty barriers to destroy Kenjaku's domain. Tengen also served as a distraction where they could in order to give Yuki and Choso any advantage possible.

Great Tactical Intellect: Tengen is a wise being with a vast wealth of knowledge, especially as it relates to jujutsu sorcery. It was around Tengen's planning that Megumi and his allies formulated their operation to rescue Tsumiki. Their group was able to gain all the proper answers they needed from Tengen and formulated a plan of action to combat the Culling Game.

Tengen contributed the majority of the tactics Yuki and Choso employed during the fight with Kenjaku. Tengen accurately predicted that leading Kenjaku into an area made of barriers would make him comfortable and centered their plan around repeatedly surprising him to force him to expand his domain and burn out his cursed techniques. When Kenjaku unveiled his domain, Tengen immediately recognized it possessed an open barrier just like Sukuna's. Tengen quickly adapted and assumed the edge of the guaranteed-hit area served as the outer shell and erased it along with his empty barrier.

Trivia

 * Their name has the Kan-on readings for "heaven" (天, ten) and "origin, foundation, basis" (元, gen).

Battles & Events
Culling Game Arc
 * Yuki Tsukumo & Choso vs. Kenjaku