Planet of Hats: Velocitron and Junkion. The former is a planet where everyone is obsessed with speed, the latter is a planet where everyone is obsessed with junk.
The Quisling: Axer became a Decepticon not because of any commitment to their ideals, but because he wanted to be on the side he thought was most likely to win. So it shouldn't come as much of a surprise when he later ditches them to join the Star Seekers.
The Smurfette Principle: Slipstream seems to be the only female Decepticon. However, she is not the only female character in the book — there's also Override (who is of much more importance to the plot) and Solus Prime, who technically only appears as a hologram.
Take a Third Option: The Star Seekers, lead by Thundertron, are neither Autobot nor Decepticon. Due to Thundertron's hatred of Cybertronians, their main goals is to hunt down any and every Cybertronian still alive.