Percy

Percy is...A Sattle Tank Engine Who Is Good Friends With Thomas

Biography
Bio In The Railway Series

"Percy was most likely built by Avonside sometime around the 1900's and had gone through a subsequent rebuild in the years preceding his second-hand sale to the North Western Railway. He is said to have been found wearing Hunslet parts, according to workers at Crovan's Gate"

-The TTTE Wiki

Bio In NSBB

Percy Is Thomas' Best Friend And LOVES CHOCOLATE. He Is Also Afraid OF Things Bigger Than Him