Beast Modes

A Beast Mode is a Transformer's alternate mode in the form of an animal and or has organic or inorganic materials integrated among the Transformer's mechanical form to suit their needs instead of a vehicle mode.

Autobots

 * Heatwave
 * Boulder
 * Chase
 * Blades
 * Dinobot s
 * Grimlock
 * Slug
 * Swoop
 * Snarl
 * Sludge (presumably in the comics)
 * Clipshade (presumably in the comics)

Decepticons

 * Airachnid-partial (Terrorcon)
 * Tantrum
 * Chop Shop
 * Filch
 * Scorponok
 * Glowstrike
 * Paralon
 * Saberhorn
 * Shadow raker
 * Insecticons
 * Sharpshot
 * Hardshell (offline)
 * Kickback
 * Bombshock (possibly offline)
 * Razorhorn
 * Ser-Ket (offline)
 * Backbite
 * Steeljaw
 * Underbite
 * Minitron
 * Clampdown
 * Bisk
 * Springload
 * Quillfire
 * Groundpounder
 * Sharkticons
 * Hammerstrike
 * Ragebyte
 * Buffaloids
 * Terrashock
 * Overhead
 * Silverhound
 * Corvicons
 * Filch
 * Flamefeather
 * Scuzzard
 * Boostwing
 * Jacknab
 * Pilfer
 * Ped
 * Skullcruncher
 * Razorgrille
 * Skunkticons
 * Malodor
 * Zorillor
 * Nightstrike
 * Vertebreak
 * Octopunch
 * Scowl
 * Zizza
 * Pseudo
 * Scratch
 * Polarclaw
 * Crazybolt
 * Simacore
 * Stockade
 * Crustacion
 * Wingcode
 * Clawtrap
 * Scatterspike
 * Thermidor
 * Paralon

Mini-Cons

 * Aerobolt
 * Tricerashot
 * Sawtooth
 * Velocirazor
 * Ravage
 * Laserbeak
 * Buzzsaw
 * Ratbat
 * Back
 * Forth
 * Hammer
 * Anvil
 * Airazor
 * Slicedice
 * Torpor
 * Dragonus

Neutral/Before Great War

 * Onyx Prime

Predacons

 * Predaking
 * Darksteel (offline)
 * Skylynx (offline)
 * Grimwing
 * Lazerback
 * Skystalker
 * Ripclaw
 * Vertebreak
 * Cindersaur
 * Rot Gut
 * Terrorcons
 * Hun-Gurrr
 * Twinstrike
 * Windrazor
 * Blight
 * Rippersnapper