Gordon

Premise
Before the events of the series, Gordon was the pride of the Main Line. Gordon pulled the express (the Wild Nor' Wester) and ordinary passenger trains along the stretch of line, and grumbled dreadfully on the rare occasions he was assigned goods trains. After coming to the railway and being very arrogant, Gordon began to get his comeuppances left, right, and centre. He lost his dome, was stopped by a cow, and even fell into a ditch! However, Gordon slowly matured over time. Although he was still pompous, he began to become more serious and stopped showing off for the sake of it.

He was good friends with Henry and James, although he developed somewhat of a rivalry with the former. Speaking of rivalries, Gordon also showed up a visiting engine named Spencer, much to his delight. Gordon had many accidents (the most gnarly of which involved him crashing through the Kirk Ronan station wall), but he came out stronger and faster than ever. He is also one of the last survivors of his class left (as well as Flying Scotsman, with whom he is an ally in the face of modernisation). Although he was sad for the fates of his brothers and sisters on the Mainland, he never let this sadness overtake him and remained resolute.

Gordon's pride is being fast, and although he can be boisterous and not think before he speaks, he has a heart of gold, shown most prominently when he argued Thomas' case with the Fat Controller, forming an alliance that would last for many years to come.