"Grayson" is an artifact costume in the StrikeForce Kitty series, based on Nightwing from the Batman franchise.
Dick Grayson was the original Robin and Nightwing in the comics.
StrikeForce Kitty 2
"artifact 6" can be equipped to a kitten that wears the "Warbler" costume. "Grayson" does 
melee damage, and like its predecessor, opens all teleport portals in a level.
"Grayson" adds 15 strength, 2 health, and 11 speed to that kitten, for a total of 29 strength, 20 health, and 25 speed, from "Warbler".
StrikeForce Kitty: Last Stand
Nightwing in Last Stand
"Grayson" is a costume that can be obtained from defeated raccoons in StrikeForce Kitty: Last Stand, look on pages in the "Melee" category.
See also
- Nightwing and Dick Grayson in Wikipedia
- Nightwing and Dick Grayson in Batman Wiki
- Nightwing and Dick Grayson in DC Database