And here's my character replacement. Sorry it took a while.
Name: Souji Mitsuka
Age: 16
Gender: Male (Female when transformed)
Appearance: "TAIL, ON!"World of Origin: Ore, Twintails ni Narimasu (Gonna be the Twintail!)
Personality: Souji is in general a pretty calm and collected person as affable and mild in attitude (albeit one that likes to snark every now and then when particularly weird things are happening). When he sees things that are wrong though, his sense of justice ignites and he gets rather into things as his other persona Tailred. Also he has an incredibly pure love for twintails to the point that it boosts his morale if he can touch them.
History: As a child, Souji had an obsession with the twintail hairstyle, which his friend Aika teased him over. This maintained itself for his entire life. But, as fortune would have it, on the first day of high school he saw the student council president being attacked by evil aliens known as Ultimagil, who wanted the power of her Twintail attribute. It was then that Twoearle appeared, giving Souji the Tail Gear. With it, he was able to defeat the Ultimagil and save the day. From then on he became a twintail warrior, fighting the Ultimagil across the globe as he operated out of a secret base constructed beneath his house, thwarting the Ultimagil at every turn. In time, his friend Aika and that student council president Erina joined up with him, creating the group the Twin Tails, and gaining international renown. All this while dealing with the various situations that arose in his normal life.
Abilities: In his transformed state, Souji has access to a plethora of magical girl/sentai based ability such as vastly boosted physical strength, endurance, reaction times, and agility. Besides the superhuman physcial abilities, she gains access to limited pyrokinetic abilities like setting her sword on fire, turn her hair ribbons into flaming swords, or shooting out flames from vents in her suit to use as an impromptu jet. By using a special hair ornament system called the Progress Barrettes and changing her twintails style, she can assume one of either two super modes: Faller Chain (increased speed/reaction times) or Riser Chain (increased attack power/brute strength), both of which she can only use for 22 seconds at a time due to their unstable nature. Lastly, she can perform a powerful area control attack called "Aura Pillar", which drops a giant column of hyper dense elemental energies on the targeted area to restrain movement of enemies so the following finishing move "Grand Blazer" can be used- though Aura Pillar's weakness is that Souji can really only use it when her feelings are at an emotional peak such as excitement, anger, fear, happiness, etc.
Other: Souji really, really, really, REALLY likes twintails.