Eta

The seventh seat of the Shadow Seven. Ages 15 to 17. A researcher with a laid-back attitude and long, light brown hair, excelling technically as an elf.

Became interested in "science" after hearing about it from Shadow's "Shadow Wisdom," and conducts various research and development based on it. Delves deeply into interests like architecture and research, sparing no time for sleep, but appears lethargic and sleepy when uninterested, sometimes falling asleep as is.

A so-called mad scientist, proclaiming "sacrifice is necessary for progress," and administers drugs and experiments among peers. In the main story, Beta, and in "Kagejitsu!," Delta and Epsilon suffer from these experiments. Always looking for a chance to experiment on Shadow too, but consistently fails.

The only one among the Shadow Seven without any loyalty to Shadow, acting primarily on personal desires. Zeta's betrayal was in line with Shadow's intentions, but attempting to experiment on Shadow without his consent makes him the most dangerous among the Shadow Seven. Thus, disliked by the newest member, No.712. However, like the others, values the "Shadow Wisdom" given by Shadow, showing eagerness in "Kagejitsu!" by stating "Master is perfect" during a conversation with Alpha, and in the event story "Appendix: Truth Seekers" of "Master of Garden," tells Zeta that not all lives are equal, suggesting one should sacrifice their own life over the Master's, indicating a fascination with the extraordinary being, Shadow, which is why he belongs to Shadow Garden.

Undoubtedly a genius of the highest order, learned to speak fluent Japanese just by listening to Akane (No.712).

Using the technology of slimes invented by Shadow, developed several types of slimes, and as Eta Lloyd Wright in the public society, involved in architecture at various branches of Mitsugoshi Company, known as a "once-in-a-generation architect." After Mitsugoshi Company discovered an oil field, started developing an "internal combustion engine" and "automobiles" as power sources, inspired by the "Shadow Wisdom."

In the TV anime version, appears much earlier, seen dragging a giant wrench as tall as himself and setting up his inventions when Shadow disguises as Jimina Senen, exiting on a cart. Also active as a designer for the fashion brand "Comme ça de Mitsugoshi," gaining popularity for sophisticated designs, and provides them to Sid as a street model through Gamma at no cost.

In volume 5 of the book series, narrated from Eta's perspective in "Eta's Research Journal."

In "Master of Garden," forms a large number of swords with slime, using them as projectiles for long-range attacks rather than wielding them.

Refers to Shadow as "Master."