Off the top of my head baddies sporting red include: Rumble, Starscream, Laserbeak, Megatron (inside arms/legs), Insecticlones (eHobby), Ramjet (wings), Astrotrain (white version; eyes, decos), Magnificus, Blitzwing (eyes), Breakdown (face), Dead End (maroon), G1 Predacons, Runabout, Scourge (eyes), Spectro, Flywheels, Apeface, Triggerhappy (face), Soundblaster, Wildfly, Deszaras (eyes, decos, Eaglebreast), Gaihawk, Jalgar (weapons, Jaguarbreast), Dino Force, Stone Cruncher (face), Excavator (crane arm), Knockout (crane arm), Metrotitan (incl. Metrobomb & Metrodash), Black Zarak, Overlord (eyes), Snare, Stalker, Calcar, Aquablast (stripes), Tornado/Windrazor, Dreadwing & Smokescreen, Swindle (G2), Bulletbike, Space Case, Skyjack, Hooligan, Terrorsaur, Scorponok (BW), Lazorbeak, Hydra, Magmatron (Skysaur), Quickstrike (eyes), Spittor (TM), Razorclaw (video ver.), Ravage (BW; eyes), Megatron (BW, eyes, all version - TM2 is predominantly red), Jetstorm, Tonbot, Manterror & Mantis, Shadow Panther (eyes), Big Mos, Powerhug (eyes), Scarem, Dinobot (TM2, eyes), Injector, Terragator (eyes), Sky Shadow (BW), Waspinator (TM), Scavenger (BW), Rampage (BW), Gimlet, Motorarm, Scourge (BW), Bazooka (eyes), Dead End (BW), Sling, Archadis, Airraptor, Sabreback, Autolauncher, Megatron (BM), Scavenger (BM), Blastcharge, Jetstorm (BM, Dlx & Ult), Sonic Attack Jet, Tankor, Strika (eyes, window), Tripredacus Agent, Megabolt Megatron, Megatron & Galvatron (RiD; eyes), Scourge (RiD), Nemesis Prime, Megatron (Armada), Starscream (Armadaverse), Galvatron (Cybertron), Demolishor (Armada), Scrapmetal, Demolishor (ROTF), Knock Out (Prime), Swindle (Movie), Rampage (ROTF Legends, non-combining), Scavenger (ROTF), Rumble (Device Label), Rumble (Prime AM), and many Decepticon eyes in BT/ALT, Alternity, Classicsverse, Animated, TF Prime & Movieverse.