E: Lego Bionicle pieces assembled, but not sure from which set
K: Armada Blurr's lower leg
M and N: My gut is telling me that these are from some Power Rangers toy, but I don't know which
P: A Lego propeller piece
R: Lego Bionicle "Kakama" mask belonging to the character named Huki/Hewkii. This mask saw two releases. First as part of Huki's McDonald's Happy Meal release in 2001, and later in 2003 when Hewkii was given a new toy at mass retail.
S: Lego Bionicle shell carapace cover piece belonging to the Bohrok species called Tahnok
X: The wings belonging to Digivolving Silphymon from Bandai's Digimon line, part of the Season 2 series.
AA: The chestplate belonging to Warp-Digivolving Gallantmon Chaos Mode from Bandai's Digimon line, part of the Season 4 series (redecoed from the very limited-release Warp-Digivolving Gallantmon Crimson Mode of the Season 3 series, which was also rereleased but equally limited in the Season 4 series)
AB: One of Armada Unicron's ring connector pieces
AC: Lego Bionicle piece
AD: Lego piece, likely from the same Bionicle set as AC
AG: Lego Bionicle mask, don't know which, though
B: I feel like I should know what these are, but they're escaping me. I'm pretty sure they're Transformers pieces, though
F: Lego Bionicle piece
G: I feel like I should know what this is, but it's escaping me. I'm pretty sure it's a Transformers piece, though
L: Lego Technic rod piece, Bionicle sets used lots of these little pieces
P: Lego Bionicle piece
O: I feel like I should know what this is, but it's escaping me. I'm pretty sure it's a Transformers piece, though
V: Lower arm of the Walmart yellow-and-black redeco of RiD 2001 Heavy Load
W: I'm positive that this is a Transformers piece. I think it was used as some figure's lower torso flap
Y: Very positive that this is a Transformers piece, possibly part of a Mini-Con or other small figure
EE: Lego Technic piece, likely used in Bionicle