10 inches, Ariga's design, yada yada
The kanji on his chest is kage (shadow), and the shadow blade in his hand is removable.
MEGA UPDATE: This guy is in the Mega Man Tribute book put out by Udon. Per the editor's instructions, please check out these links and buy the book!
MEGA MAN TRIBUTE LIMITED EDITION HARDCOVER
-the book is premiering at the San Diego Comic-con at the UDON booth (#5037), July 20-24
-for fans not attending the show, you can preorder the book at UDONstore.com ([link]
MEGA MAN TRIBUTE SOFTCOVER
- The standard softcover edition is also available for preorder on amazon.com ([link]