From Henshin Justice:
Kamen Rider Beast is soon debuting, but his identity is still
unknown. However, because of a mistake on Bandai’s part, the name of the
character that transforms into Beast has been leaked through
Ganbaride’s mobile site.
The text underlined with blue is his name, Kousuke Nitoh. As Kamen Rider Beast, he consumes mana from Phantoms.
Kamen Rider Beast is also described as a Wizard of Ancient Times.
Kousuke Nitoh’s actor is currently still unknown, but is expected to be
revealed by the end of this month.