It's a little lengthy but I hope not over the top.
Superhero name: Doppler
Secret ID: Kyle Langly
Occupation: Celebrity/Super powered adventurer
Background: Kyle Langly was born with the power to move object with just a thought. But his power was initially limited and appeared to be crude able to shove things or pull them towards him but little else. Worse, his abilities sometimes activated unconsciously when he was startled, nervous or otherwise emotional. Already shy, Kyle became even more withdrawn and reclusive to avoid accidentally hurting anyone and the embarrassment his powers could cause.
Kyle turned to books for companionship and discovered that he had a talent for physics and higher mathematics on top of sharp mind. He threw himself into the subject, the start of a life long love and even won several science and essay competitions through his childhood and teens, eventually being awarded a scholarship at a prestigious university in applied and theoretical physics. Kyle found himself drawn to the field of paraphysics: the study of metahuman powers and their relationship to the laws of nature. He decided to use himself as a subject. His meager powers should be useful for something.
However in the course of research, Kyle learned that nature of his abilities was quite a bit different than originally thought. They weren't psychokinetic, not strictly psionic at all in fact but based on the ability to manipulate some fundamental forces of nature. The revelation was life changing like a door had opened in his mind. He worked harder, not just studying his power but working to hone it, swiftly developing an array of abilities as his understanding grew. And with that understanding came a new confidence and assurance. He wasn't somehow a failure with a meaningless and dangerous "power" as he'd always secretly feared. After using his new found abilities to thwart a campus shooting, Kyle's personal transformation culminated in the creation of a costumed identity: Doppler.
Persona: The introverted. academic and, frankly, nerdy young man the Kyle was has changed. He's now much more confident, bold and daring. He's not reckless but is much more willing to take risks and stand up not just for himself but for others and against injustice. He hasn't become arrogant or a blowhard thankfully and still likes quiet moment and intellectual pursuits. but he's much more willing to try new things. He's still more than a little clueless when it comes to interpersonal relationships though, especially with women. As Doppler, Kyle is even more extroverted and outgoing, even a bit of show off. He projects a cool confident and ever so slightly smug air that can annoying touchy criminals. In both personas he's unfailingly polite and a bit of a neatnick.
Powers: Kinetic control. Can add, remove and redirect kinetic energy and inertia with incredible aptitude and precision. At low levels his power mimic psychokinsis, enabling him to move objects but in a direct manner as if he were "pushing" them. At higher levels he can accelerate and decelerate targets rapidly enough to damage them, even shake them apart if applies continuously or stress living targets to with dangerous G-forces. crudely teleport himself and other targets but accelerating them to near light speeds and stop something dead by leeching all its kinetic energy and increasing its inertia. He can effect himself with his abilities and is immune to most of negative consequences that might result. Kyle can defend himself by sapping the kinetic energy of physical projectiles and creating dense shields of "Solid air" by slowing and stilling air molecules. He's learned to turn them momentum from his jumps into a form flight, more a sustained leaping gliding but he looks impressive while doing it.
His defenses require some awareness and conscious effort though so he wears an armored (and somewhat gaudy) costume for extra security. The costumes coloration is based on the red shift/blue shift effect his power create, particularly at high levels. It has some built in gadget such a GPS, visual enhancement, glare protection, cellular link and other items developed by a friend (and would be SO) of Kyle's in Engineering College.