Excellent write up on Kamen Rider Black, but just one thing. It’s not a “Sentai series”. Sentai is for groups, most notably the Super Sentai in its various forms. The word itself means squadron, task force, and so on. So you wouldn’t apply it to Black. Henshin Hero is sometimes used for those solo characters who “henshin”, transform. Or even just “tokusatsu”, special effects, which is the overall genre for shows like Black, Super Sentai and co.