Haruka Yamaoka

Isshin is member no. 6 of the Round Table. They are a Negator with the alias Unbreakable.

Appearance
Isshin's design seems to be based on a traditional Japanese samurai armor called Yoroi. They are also quite bulky in their build, towering over the other members in the Union. They wear the Union logo on their helmet, right above their face.

Isshin's true appearance beneath their armor is unknown, other than their eyes.

Personality
Isshin has been shown to be a quiet and protective person, showing great care for their fellow members. They seem extremely attached to their armor, not wanting to take off their helmet even after being severely wounded in the neck, not making it easier for Nico to check the wound in the process.

Spoil Arc
When Andy and Fuuko join the organization, Andy shoots fingers at each member, but Isshin lets the finger hit them and moves one of their hand's to protect Phil from the other finger. When Apocalypse reveals the new quests, Isshin along with other members take on UMA Burn's quest.

When they captured Spoil, Shen calls for help in stopping Victor and Isshin along with the rest come fight Victor. Isshin slams Victor from behind, making Victor comment that they used only brute strength and if Isshin doesn't fight him, he may let Isshin live. But as they kept fighting, Victor realizes how sturdy Isshin is, as his attacks has no effect on Isshin. Isshin then grabs Victor and lets Phil shoot both Isshin and Victor, while burning Victor, but having no effect on Isshin.

Abilities
Unbreakable (不壊): Anything forged by Isshin never breaks regardless of how severe the damage is, obtaining the Unbreakable kanji.
 * Enhanced Durability: Isshin has great durability, resisting victor's attacks without taking damage, also suppressing a laser that incinerated one of victor's clones without taking damage

Enhanced Strength: Isshin has great brute strength which corresponds to their great physical size, slashing Victor in half with a blow and cracking the ground beneath him.

Equipment
Samurai Armor

Naginata

Trivia

 * Isshin ranked 23rd in the First Popularity Poll.