Ritsuko Usaka

is a girl who has been blamed for various unexplained incidents in Amanogawa High School due to her tendency to isolate herself and have certain psychic powers, much like Tomoko. She gives into the persecution and becomes the bad girl everyone perceives her to be as she forms her own witches' coven called the with other scorned social outcasts.
== History ==
She is given a Zodiarts Switch by Scorpion Zodiarts, allowing her to transform into the , granting her powerful telekinetic powers via her staff. However, Ritsuko's passion for the occult evolves her Zodiarts form to also use pyrokinetic powers. Creating moon pendants for her followers to wear, Ritsuko uses her powers to make it appear that she and the members of her group are actually witches before Kengo exposes the deception. By then, using the Zodiarts Switch in its Last One state, the Altar Zodiarts proceeds to enact her plan to burn the entire school to the ground.
When her plan is ruined, she becomes infuriated and overpowers Kamen Rider Fourze in battle. Upon transforming into Firestates, Kamen Rider Fourze absorbs her fire-based attacks before destroying her Zodiarts form with the Rider Exploding Shoot.
She returns later on during the Coma incident, where she once considered taking Gentaro to the dance, but the Rider's questioning hurt her feelings and declined the thought. She was later seen with Ryusei Sakuta, who went with her under a threat from Tomoko.
== Form ==
The is the Zodiarts form associated with the constellation of . She can emit fire from her head and has a wand that can telekinetically control objects, enemies, and herself.
*Height: 219 cm
*Weight: 180 kg
==Equipment==
===Device===
*Zodiarts Switch - Transformation trinket.
==Behind the scenes==
===Portrayal===
Ritsuko Usaka is portrayed by , who previously portrayed Amane Kurihara in Kamen Rider Blade.
===Concept Art===
Altar Zodiarts was designed by .
==Appearances==
* Kamen Rider Fourze
**Episode 9: Witch's Awakening''
**Episode 10: Moonlight Clash''
**Episode 25: Graduation Reluctance''
**Episode 26: Perfect Round Dance''
**Kamen Rider Fourze The Movie: Everyone! Let's Feel the Universe!
Category:Fourze Characters
Category:Kamen Rider Fourze
Category:Zodiarts Switchers
Category:AGHS Students
Category:Evil turns good
Category:Object Monsters
Category:AGHS
Category:Fire Monsters
Category:Female Monsters
ru:Рицуко Усака
Category:Wizard Monsters