Permanency can be used on a spell called Enlarge Person (Which doubles height and octuples weight), which means you can make a Medium character Large forever

Enlarge Person has a limit of Huge, so it could then be cast again on a Permanencied Large

Bloodrager's Abyssal bloodline has a feature at level 4 called Demonic Bulk, which functions like Enlarge Person while Bloodraging, but can stack with it and above its limit, as a Supernatural Ability

ergo a character who was originally 6' 1" and 180 pounds could become 48' 8" and 92160 pounds