Shapeshifter

Transformer refers to a champion with multiple forms.
 * Ranged Mage / Melee Assassin with two sets of abilities.
 * and
 * Ranged Carry / Melee Fighter with two sets of abilities.
 * Ranged Support / Melee Pusher with two sets of abilities.
 * empowers him, granting him area of effect damage and healing.
 * empowers her, enhancing each of her abilities.
 * empowers him, granting him area of effect damage and healing.
 * empowers her, enhancing each of her abilities.

The follow champions could be considered as using multiple forms:
 * empowers him, granting him bonus health and area of effect damage that increases his attack damage.
 * empower him, granting him bonus health, area of effect damage and passive fury generation.
 * 's stances change his appearance.