Jin Seipatsu/Shadow Walker

Jin's Shadow Walker is his alter-ego from his time in the Great Void and as a SinWorker. After being defeated by Lakasha, the memory loss from exiting the Void causes Jin to develop a different personality and causes the Shadow Walker to sleep within him. The Shadow Walker is the representation of Jin's past. It makes its first appearance in the Scaredy Cat Radar story where it tells Jin that it would take over the role of rescuing people.

## Advancement Quest

After obtaining a Sin Fragment from a Blazing Void, Jin uses it in order to visit his former self. Jin mets with his Shadow Walker; who chastises him for wasting time and that he should put all of his effort into saving people. Any time wasted is considered unjust and it tells Jin that he should return its body for this reason. Jin is at a loss for words and is unable to give a proper reply for to the Shadow and tells it to wait for an answer. He then obtains another Sin Fragment and asks his shadow: two questions about his rationale. The Shadow responds that it prioritizes saving others at all costs and is its calling in life but is unable to reflect on its previous actions: considering moving forward with rescue more important than long-term care. Jin replies that this is the main difference between the two as the current Jin is able to work alongside with others while the Shadow is only concerned with its crusade. However, the Shadow belittles Jin as it took the action of saving others no matter the cost and the current Jin is only a fake hero. Jin claims that he would save the shadow from its thought process and leaves for Grasscover Camp.

At Grasscover Camp, Jin asks Tenebris about their previous relationship in past due to the Shadow mentioning his role with protecting the camp. Tenebris answered that Jin treated Tenebris like an idol and offered him more respect than he deserved: often wondering what would happen to Jin if Tenebris were to fall. However, Tenebris becomes concerned with the question and asks Jin about his reasoning. Tenebris then learns that Jin highly likely became a SinWorker due to his promise with Tenebris: protect Grasscover Camp; No matter what the cost. He then implores Shiho and Jin to visit Jin's Shadow Walker in order to apologize to him. Shiho states that because the current Tenebris is a ghost; he will be able to visit the Shadow Walker. Afterwards, Jin obtains another Sin Fragment to visit the Shadow together with Tenebris.

The Shadow appears to mock Jin once more but is stopped by Tenebris. Startled by his appearance, the Shadow is pleased with his arrival and asks him to affirm his actions and convictions. However, Tenebris is disappointed with the Shadow since it took his promise too far and he eventually lost the camp that he vowed to save. He then releases the Shadow of its commitment and tells him that he had no obligation to listen to a fool's promise and that Tenebris was not a hero for falling first. Stunned by Tenebris's response, the Shadow tries to convince the current Jin's path is wrong. However, Tenebris states that Jin is following the correct road and the Shadow no longer needs to worry about the wrong path. Out of respect for Tenebris, the Shadow consents to Tenebris's opinion and fades away.

## SinWorker Quest

The Shadow Walker makes another appearance in the SinWorker quest where Jin attempts to find a method to control SinForce. After using the Sin Fragment formed from Erwin's clone, Jin visits his Shadow Walker for more power. The Shadow is confused with Jin's request since the last time that they met; they agreed that his power was wrong and did not understand why Jin needed its power. Jin replies that a powerful enemy has appeared and that the Shadow needs to trust him with this task. The Shadow warns Jin that its power would corrupt Jin and would force him to take the lone hero's path once more. After Jin tells it that his conviction has not changed and its power is to only used for a new inspiration, the Shadow agrees to lend its power.

After obtaining SinForce, Jin ends up struggling to use it and uses Yorhaka's advice to adjust to it. After his body as acclimated to SinForce, Jin notices that his clothes changes and describes the outfit having a overly comfortable,legatharic like-feeling. He does not wish to continue using the clothes as a medium and uses the stone from Yorhaka instead.

After mastering SinForce, Jin summons his Shadow Walker onto the Dirty Bookshelf. Jin apologizes to his Shadow Walker for not being straightforward with how he planned to use its power. The Shadow Walker questioned if Jin was taking the same route due to his desperation for its power. However, Jin replies that he wishes to become stronger but does like to become alone like the Shadow Walker. He tells the Shadow that all it needs to do is to find a different way to assist others and Jin affirms his commitment to save others. The Shadow questions its actions but Jin claims that it was only unlucky. Afterward, the Shadow Walker tells Jin of its previous actions in the Void. It sacrificed reasoning in order to obtain more power in the Void and came to the conclusion of killing the weak in order to save many but eventually the past Jin was all by himself. After multiple failures, this was the only way for the past Jin to calm himself and his duty became a means of protecting himself. The Shadow believed that Jin was following this eventual path but seems to gain hope that one can live with self-sacriface. Before vanishing, the Shadow Walker agrees to continually lend its power to Jin and to continually watch over his potential.