Size is size, this is just a rough sketch of the sizes available to
characters.  Note, no character should go over 9 in robot mode without
explanation.
 
   -     1     --Rumble/Frenzy in Cassette Tape mode, children, rocks,
                 dogs/cats.
   -     2     --Teenagers, large animals; Big dogs, wild cats.
   -     3     --Rumble/Frenzy in Robot mode, adult humans, lions.
   -     4     --Bumblebee/Brawn, small/compact cars, mopeds.
   -     5     --Gestalt members; Hook/Mixmaster, normal-sized cars.
   -     6     --Normal Robot mode; Sideswipe/Prowl/Seekers, trucks,
                 helicopters, regular Sweeps
   -     7     --Gestalt Leader; Motormaster, Scourge, Hot Spot
   -     8     --Large Transformers; Ultra Magnus, Jetfire, Cyclonus, Dinobots
   -     9     --Shockwave, Scorponok, Fortress Maximus
   -    10     --Sky Lynx., Cyclonus and Jetfire's transport modes
   -    15     --Gestalts; Devastator.
   -    16     --Omega Supreme/Predaking
   -    17     --Transformer transport; Ark.
   -    25     --Moons, large asteroids.
 
Remember anything over a size 9 is rare. Even so that there will rarely
be a size 9 OC unless there's good justification for it.