Sunstreaker Bunny
Everyone knows that Sunstreaker is super vain, and is always making himself look good and showing off. But what if that's not really the case? Sunstreaker has a lover, one that not even Sideswipe knows about (he's too busy with courting his own love interest to notice, or whatever reason you can come up with). This lover, however, is extremely controlling and is constantly putting the golden twin down. He makes Sunny feel very insecure about himself and is constantly telling him how ugly is and how lucky Sunny is to have him, because no one else wants someone who is so ugly. Sunny becomes obssessive about keeping himself looking good. However, while polish is good for mechs when used appropriately, too much will corrode plating and begin destoying circuitry. Eventually other Autobots start to notice how brittle Sunstreaker is becoming, but Sunny can't see it. All he sees is an ugly, tacky mech when he looks in the mirror.