Within the past two waves of Legion Class (the smallest!) Transformers toys, there've been some older guys redecoed into new folks who otherwise don't have toys. And I'll pick them up! Why not? New guys! Plus two of them were molds I hadn't owned before.
Flamewar is the most interesting character choice. The original Flamewar was a BotCon 2005 exclusive toy and since then she has only appeared in BotCon and Collectors' Club-related materials, until now. Like before she's a redeco of a motorcycle Arcee toy. But now she's got a grudge against Arcee as well! ...basically, she's Airachnid. But now in that "I hate you and want to kill you but I am also wearing your skin" sort of way. Her packaging art doesn't dispel any creepiness.
There's also Fallback, which is what Hasbro has to call Outback these days for steakhouse reasons. (Yeah, it's a restaurant, but they also hold the trademark for toys for some reason. Probably merchandise.) Fallback is a redeco of Legion Class Breakdown. Like Flamewar, he hasn't been mentioned on the cartoon, but in the most recent episode, Optimus Prime ordered his troops to "Fall back!" and so I like to pretend that Fallback is always just off-screen where we can't see him and that sometimes Optimus Prime yells at him.
Tailgate has been mentioned and seen on the cartoon, as he is Arcee's notorious first ill-fated partner. He was a redeco of Cliffjumper in the cartoon as well, so this is a good use of the Cliffjumper Legion Class toy. His transformation is crazy and I love him. It's amazing how much versatility you can get out of a pile of ball joints. He's seriously impressive for his size.
If you don't care about getting new characters, I'd still get Tailgate just for the hell of it. He's pretty and his toy is a neat thing to keep around in your pocket.