Despite growing with older orphans like Marco and Ai, Ta-kun seems to be younger than them, and around the age of both Yukiteru Amano and Yuno Gasai if not just a bit older than them. He like most of the orphans wears a white trench coat, along with a pair of black framed sports googles with yellow-brownish lenses he has long dark brown hair.
Like most orphans under Kamado's wing, he is indebted to her and loves her greatly. For this reason he will do anything to ensure she becomes god, as he believes she will be more than capable of creating an ideal world. Despite willingly taking arms for the sake of Kamado, he seems to avoid exposure at most. He also seems to display a certain code of honor, as he willingly accepted an alliance with Yuki and Yuno, and was terrified when he finds about their betrayal, suggesting that although he may want Kamado to be god, he does not employ dirty tactics.
Also the fact he is one of the most active of the orphans, suggest that outside Ai and Marco, he's one of the oldest and to a degree, leader of the rest of the orphans. The nature of his "Copy Diary" suggests he may look up to some people more than himself.
Diary & Abilities
The Seventh's Battle of Love
Ta-kun spied on the Kosaka Mansion when Kamado's forces invaded the mansion to kill Yuki and Yuno. He played a role in setting off the explosives in Sakurami Tower, which destroyed the tower and inadvertently killed Marco Ikusaba and Ai Mikami.
The Eleventh's Kingdom
After Kamado made an alliance with Yuki and Yuno, Ta-kun, Orin Miyashiro and around twenty other orphans ambushed the Eleventh John Bacchus on a mountain road. Ta-kun stood next to Kamado, monitoring the fighting and Yukiteru, whom he feared was up to something. However, John Bacchus disables their apprentice diaries with a signal jammer in his car, and thus removing the powers the orphans had. At this moment, Ta-kun notices Yukiteru running away from the fight against John's forces. Ta-kun watched in horror as Yuno and Yuki betrayed their alliance, Yuki backstabbing the orphans by shooting them with a pistol while Yuno in turn kills Orin with her sword. Enraged, Ta-kun fights Yuno, calling them traitors. Yuno eventually stabs Ta-kun through the chest, his final words telling Kamado to run to safety before he died.
The Final Battle
In the anime, Ta-kun and Orin stand cheerlessly in front of the orphanage to see off Kamado, who walks away arm-in-arm with John Bacchus.