Über's power grants him a high level of skill at anything he tries his hand at. Wildbow has commented that people tend to overestimate his power - "it would perhaps be better to say that he's able to learn techniques."
He can for example do a martial arts recovery but does not have the requisite skill to have proper balance and poise. Further he alter his voice like an announcer or professional voice actor.
Formed a partnership with Leet so that they could "spread the word about the noble and underrated art form [of] video games". They streamed their antics to the internet, they received more revenue from this then their crimes
↑I didn’t get a chance to dwell on it, because Über charged us. I hurried to get out of his way. Über’s power made him talented. It didn’t matter if it was playing the harmonica, parkour stunts or Muay Thai, he could pull it off like he’d been working on it for hours a day for most of his life. If he really focused on it, the way I understood it, he could be top notch. - Excerpt from Shell 4.6
↑“Rest assured, Tattletale, you do,” Über proclaimed. He was the sort of person who proclaimed, announced, broadcasted and declared. Just like Grue’s power altered his voice to make him sound haunting and inhuman, Über’s power made him sound like the guy who narrated trailers for action movies or late night commercials. Overdramatic, intense about everything he said, no matter how mundane. Like someone overacting the role of a gallant knight in a kid’s movie. -Excerpt from Shell 4.5
↑Mr. Calle answered for Glenn. “Attempted murder. Bit of a loose cannon, but not so loose they’d stick him in the Birdcage. Shacked up with Circus for a while, but it didn’t take. Relationship-wise or as a partnership. They stood to lose more than they could ever gain if he got loose again, so they made it a secure facility. He hasn’t escaped.” -Excerpt from Cockroaches 28.6