Kisaragi Jou

Kisaragi Jou, created by Phineasmon302, is one of Kise Yayoi's three future children with Kisaragi Gentaro, the main character of Kamen Rider Fourze. Although he isn't a Cure, he and his twin brother Yuu are able to become the two-in-one Kamen Rider Twize (仮面ライダートワイゼ Kamen Raidā Towaize).

Personality
In contrast with his more subdued brother, Jou is more of a free spirit, having inherited his father's boundless energy and his mother's affinity for superheroes and action-oriented stories. He is also quite athletic, having developed impressive basketball prowess thanks to the influence of his uncle, Ryouta Kise, whom his mother reunited with following her middle school graduation. Although he may be a bit careless at times, he ultimately means well, having been taught that the most important thing in life is to protect and accept others.

Relationships
Kisaragi Yuu - Twin brother.

Kisaragi Nadeshiko - Younger sister.

Minamoto Kazuki - Childhood friend, in virtue of the friendship and professional partnership between both of their mothers.

Minamoto Emiri - Childhood acquaintance, in virtue of the friendship and professional partnership between both of their mothers, and eventual ally.

Hino Madeleine Taylor - Childhood friend, in virtue of the friendship of both of their mothers, and ally.

Aoki Hyouka - Childhood friend, in virtue of the friendship of both of their mothers, and ally.

Matsubara Ringo - Close friend and ally.

Amagasaki Yusura - Classmate, ally, and not so secret crush.

Kurei Neyumi - Classmate and ally.

Kamen Rider Twize
Kamen Rider Twize (仮面ライダートワイゼ Kamen Raidā Towaize) is the combined transformed alter ego of both of the Kisaragi twins, with Jou providing the 'body'. His arsenal was developed by Philip and Utahoshi Kengo as a combination of Kamen Riders Double and Fourze's powers. His transformation belt, the Twize Charge Driver, resembles and works in a similar way to the Fourze Driver, but has two Switch Sockets rather than four; as such, Twize cannot use any other additional Astroswitch combinations or forms, relying simply on his fighting skills and lightning-based powers. Like Fourze's, though, Twize's suit doubles as a space suit, and includes a hover pack.

Kamen Rider Twize is a loyal ally to the next generation of Smile Pretty Cure, and occasionally steps up to help them out in battle, although mostly allowing them to finish the job themselves.

Etymology
Kisaragi (如月): The old Japanese name for the month of February.

Jou (情, written as じょう): A male Japanese name that can have several different meanings, the intended being "feeling, sentiment, emotion"; combining the twins' names results in Yūjō (友情), which is Japanese for "friendship".

Kamen Rider Twize's name is a pun on the word "twice", alluding his two-in-one nature.

Trivia

 * The creator's idea of pairing Gentaro and Yayoi came from various Pixiv fanarts portraying Yayoi as a Tokusatsu fangirl and, as such, having her interact with Tokusatsu characters, including Kamen Rider Fourze ones (as the second half of Fourze was airing alongside the first half of Smile), and was cemented with a picture posted by Tomimori Justin (Daimonji Shun's actor) on an entry of his blog.