Thomas

Thomas is the main character of "Thomas and Friends" and a character in TAOTPS.

Role In Thomas And Friends
Thomas appeared in the second railway series book and is the number one SG engine on the island of sodor. He appeared through out the railway series until it ended.

In the TVS Thomas is the main character.

Role in TAOTPS
Unlike in his own show Thomas is not the main character, he is a supporting character. He is still number one and had his own branch line still.