Kamen Rider Revice (2021)

New Ultraman, Shinji Kaminaga, a man who could transform into a building-sized hero when various creatures threatened his city.

Both have monsters inside of them that either want to control or destroy the host. The main character helps to destroy that monster returning those people back to their usual selfs

both have monsters that come out of them that allows them to change into Kamen riders. they are always bickering and fighting like siblings but when it comes to fighting they work together

both have monsters that come out of them that allows them to change into Kamen riders. one classes it as a virus and the other demon possession.

Both shows center around a family of five consisting of an older brother who sacrifices his own interests for his family, a younger brother trying to make something of himself, a younger sister still in high school, and a father a bit on the eccentric side.

The two shows are also rare entrants in their respective series with dual protagonists. Revice having Revi and Vice and R/B consisting of Rosso and Blu.

The heroes in Revice also use inner demons to transform, sort of like how the Ultras choose a human as a host.

Will be the latest reimagining of one of Japan’s most iconic heroes. Evangelion creator Hideaki Anno will be at the helm.