harmlessly absorb kinetic energy and redistribute it for "bouncing", kinetic force fields, bubble bursts, etc. (as Speedball), harness various ambient energy sources for hyperkinetic energy lances, explosions, and thrust for flight (as Penance)
Undetermined. Staff instructor at Avengers Academy. Speedball seemed unsure if that qualified him as an official Avenger in Fear Itself: The Home Front. (Previously applied and was rejected for Avengers membership in Captain America (1st series) #352.)
Speedball became Penance in Civil War: Front Line #10.
Speedball's powers were violently changed into a more aggressive form of kinetic force following Civil War #1 and Civil War: Front Line, leading him on the road to Penance. Doc Samson eventually confirmed Robbie's Speedball powers were still present, and accessing his Speedball or Penance power sets was about his state of mind. He has since reverted to Speedball, only occasionally using his Penance powers when feeling angry or aggressive.