Kamen Rider W has many transformations, but he is transformed by Gaia's memory. There are a lot of Gaia memories in Kamen Rider, so you can make a lot of metamorphosis, so I will introduce the main ones here.
Gaia Memories: Frenzy, Ace, Luna, Blast, Metal, Trigger, Fangs, Acceleration, Judgment, NASCAR, Fear, Taboo, Clay Doll
1, Wind Ace form
2, Luna Ace form
3, Fanatical Ace Form
4. Fanatical metal form