Once upon a time, the mere mention of this swordsman's name during a confrontation would send fear to those whom were familiar with his bloody and violent past. He was a legend amongst the community of Kirigakure, earning him the respect and praise from a majority of the population. Enishi was once of the few Seven Swordsmen to successfully master all of the respective blades of each member, and this was all done in as little as a hundred days.
Sadly, the wheel of time had since turned from those days, and with the passing ages, leaving memories amongst Kirigakure that eventually faded into legend.
Enishi was born in a poverty-stricken area of Ishigakure, from the moment was born; his life was a tribulation. The mother of the boy abandoned him at the local temple and even there, he couldn't find the peace that he so desperately beseech for. The boy's sight of a happy world was short-lived when during his preteens, an albino serpentine decimated the temple; to only spare him for unlocking his potential against the devilish creature.
Those days forth were filled with darkness, but he found his light in all those he met in his darkest days; a rōnin would be his savior and took him in as his own son. The rōnin fed him, clothe him and even taught him how to fight with a sword, these arts and skills that he was taught over the years were beneficial and something he would later used in his life; although his happiness was short-lived when an unfortunate event fell upon the two.
The aftermath left him with bitterness towards his birth country of Iwagakure and he eventually scavenged enough funds to emigrate to Kirigakure no Sato. Enishi was quick to settle in his new surroundings and excelled in the local academy, becoming Genin upon his first try; his feats were praised by his seniors. The chūnin exams were cruel and enduring, as his opponents did whatever they could do to gain some sort of advantage, this was something that he was actually prepared for--as they were no match for his excellent swordsmanship and elemental kekkei genkai.
Enishi accelerated through the exams and became one of the few, whom would be chūnin but he didn't stop just there. He would catch the attention of the local higher-ups within the village, by apprehending those whom attempted to commit any high-tier crimes within the confines of the village; the man quickly went up to the ranks of Jōnin and eventually gained the moniker of "Kurenai Suisei, Crimson Comet" upon being inducted into the ranks of ANBU.
Over the next few years, Enishi had became an ANBU squad leader and gradually came under the attention of the newly elected Sandaime Mizukage, whom suggested that the man try out for an organization that he was well-affiliated with; the Mizukage even suggested to his other allies that taking on the current Seven Swordsman Leader should be part of the young man's entrance exam. The Sandaime Mizukage was met with rapport for his suggestion and after a brief meeting with the applicant, his written exam was to commence that following day. While it was announced to the other Seven Swordsmen of the Mist that his opponent for the second part of the exam was to be the very leader of the Seven Swordsman of the Mist.
The very next day, Enishi completed and greatly impressed his peers that he was able to pass the difficult written exam with 'flying colors' and proceeded to 'fight' Mioku in a strictly handicapped exhibition match, although these handicaps were of no hindrance to him as first appeared. Enishi fought the man with much enthusiasm and further impressed the group with his matching choreography to his opponent's strikes, it wasn't until six hours into the match that Mioku Kaguya decided to call it. A few days later, Enishi was informed by one of the swordmen, that he will be inducted into the current roster of the Seven Swordsmen of the Mist.
When the leader of group announced that Enishi was to be inducted as the Sixth Seat, the news didn't cause much of an up-roar from fellow swordsman; rather he was congratulated for his achievements. However only one swordsman out of the group had a bone to pick with him over the acquirement of his position, this person didn't publicly state their distaste or dispute it until it became obvious through some clear observation skills that this man was on an entire different level from the rest of his peers. This suspicion became evident when his leader laid out all of the seven blades and requested that the full roster of members pick their respective weapon. Instead the man opted out of picking his weapon and publicly asked his leader for permission of the usage of the scroll that sealed the seven dangerous swords to further his agenda on mastering each blade; becoming an exceptional swordsman through his grueling thousand-day training regime.
After this training-regime was done, the swordsman humbly returned the scroll back to the leader of the organization and was subsequently given the only blade of the seven that wasn't chosen: Shibuki.
Enishi appears to be a reasonable man that is very trusting of people, this is shown when he believed that he kept on losing at a gambling parlor purely by coincidence. The moment he was told that he was being cheated and that the swindlers tried to kill him for revealing their trickery, he retaliated mercilessly; delivering his own swift form of justice. Despite his responsible personality, he seems to enjoy gambling and drinking in his spare time and is generally not entirely serious with his duties as a metallurgist--as he was last seen playing dice at a gambling parlor even when he was supposed to find out the origins of his amnesia--his devil-may-care attitude has generally made him a target for various groups looking to cash in on his vital information treasure trove of Kirigakure; that of which is currently lost inside the man's inner psyche.