The Ninja Saviors: Return of the Warriors is a brand-new remake of The Ninja Warriors in the same vein as Wild Guns Reloaded that released last month, and the official website for the game has since been updated with concept art for the various playable characters, including newcomers Yaksha and Raiden.
Check them out below:
Main visual rough draft (+ unused main visual)
Early concept for Yaksha and Raiden:
TGS 2018 Illustration
The Ninja Saviors: Return of the Warriors is available in Japan and Asia on PlayStation 4 and Nintendo Switch. The game has been announced for Western localization but has no release date.