Origin: Shin-Super Robot Taisen Age: 18 SRX-team member, ranking Sgt. Maj. (曹長). Pilot of R-1 (Powered), Real Personal Trooper Type-1 (Source: PS2 "Super Robot Taisen Original Generations" & "Super Robot Taisen Original Generation Gaiden" character libraries)
Date was a doctor who worked at the same hospital as Shiki Murasaki. He was involved in a medical malpractice in the hospital and after realizing Murasaki was willing to assist with the cover up out of her respect for him, he manipulated the hospital management into making her a scapegoat in order to protect himself. Murasaki entered his name into the Btooom! reality game as a result (although whether he knew this or not remains unclear) Date died while trying to escape the island. He was shot in the face while wearing a gas mask. He was shot for the gas mask, although after this, it became useless.
She is a tsundere towards Sora. She wishes to stay in possession of Sumita, a Student Council member, in order to free the abused girls. That is her goal. In the past, she wanted help from others to free the girls but no one would help, leading her to work and depend on herself alone. That leads to her cold personality. Sora defeats Sumita and recieves her. She's afraid it would stray her from achieving her goal, so she attempts to get back with Sumita. Later, Sora attempts to help her since they have a common goal. She realizes that Sora is a good person and doesn't want to get her involved. She ends up with Touga, a demented Student Council member who has destroyed many of his weapons and "plays" with his possessions. He was instructed by El not to release her, nor fight anyone using her. Sora comes to the rescue and comes up with a plan to free her using the penalty process. She "violates" her until Touga realizes what they're trying to do. Sumita is with him, and tells him to release her. She is freed from Touga and is possessed by Sora. It is hinted that she has feelings for Sora.
Bontenmaru is the second member of the Shiseiten to appear in the story. Arrogant and in love with his own legend, he constantly reminds everyone that he will become the ruler of the world and that both Tokugawa Ieyasu and the Mibu Clan are going to be destroyed so that he can become Shogun, much to the ire and boredom of his traveling comrades. Nonetheless, he is a great friend as well as a fearsome foe. Bontenmaru suppresses a beast inside of him, and that's what most terrifying about him. His real name is Date Masamune, the "Oda Nobunaga of the north." His weapon of choice is a Bokken. He is so skilled with it that he is able to use it against a real sword, instinctively turning it at the last second so that it absorbs the blow of a sword but doesn't break. He is also capable of killing an enemy rather easily with a wooden sword. He can unleash the beast within himself using his Satsujintai fighting technique, in which he can enter a berserker rage and tear foes apart with his bare hands. He uses his great strength as a weapon in battle. He can effortlessly defeat small groups of Mibu warriors without getting hurt. His muscles are strong enough to stop blades from piercing his skin. He has a friendly rivalry with Kyo, and much of their time is spent glaring at each other and trying to establish dominance. His Satsujintai is a hand to hand fighting technique, and his most powerful technique is the Kosoga. He swings one fist upwards in an uppercut motion and another downwards to form a vertical pincer, which can be used to break bones or, at a later stage, create a massive crater. (This technique can also be used horizontally.)