male
"Devious" Diesel, as his name implies, is a sinister diesel shunter who originates from British Railways, and is the first diesel engine to arrive on Sodor. In the television series, Diesel eventually becomes a permanent resident of Sodor.
Diesel (Thomas and Friends)
Dilophosaurus
for Dilophosaurus in A Train Story (a spoof to HoopsandDinoman's A Dinosaur Story)
Suggested by braydenlockhart
Thomas saves the other engines from a Flash Flood.