Dead End is as creepy as they come. He crawls on all fours and keeps to the shadows so his optics will glow creepily. He isn't really capable of carrying on an ordinary conversation, and when he has something to say at all, it is something strange or gloomy. And when he wants to recharge, he siphons off the fuel from other Transformers.
As a result, he's not very popular among his fellow Decepticons. They know that if there's no Autobots to feed on, Dead End will sneak over while they're recharging and start feeding on them...
Drift was not always an Autobot. In fact, he slaughtered quite a few when he was known as the Decepticon Deadlock. But Deadlock's eyes were opened to what the Transformers' war had become when he stumbled across a lost faction of neutral Transformers long since forgotten. He discarded his ruthless ways, abandoned his guns for swords, and changed his name and appearance.
When Drift returned to the Transformer war to make right what he put wrong, he was a bot of few words and disciplined action. He since went on to be an enthusiastic spiritualist and a self-punishing crusader, all in an attempt to get away from the nasty parts of his personality that are still lurking within him. It doesn't matter what his personality is because with his Decepticon past, Drift isn't well-liked or trusted by a few of the Autobots and someof the Decepticons think he's just lying about having changed. This hits Drift more than you might think because at the end of the day, despite his loner attitude, Drift reallyy just wants to be part of something.