Personaly for me its their insert theme. Even better for anime points play the Fuoto Tantei PI version. On a side note I hope that even though the blie archive character will probably defeat the villain that each Kamen Rider for each villain comes and make a cameo.
My suggestion would be this. Read 7th Time Loop: The Villainess Enjoys a Carefree Life Married to Her Worst Enemy! for free on MangaDex! https://mangadex.org/title/e326fcfb-ec60-4f6b-877b-ab2448c678d3/7th-time-loop-the-villainess-enjoys-a-carefree-life-married-to-her-worst-enemy. Been thre years...
Still love the fact that MC power is imagination. Perfectly suitable for any tokusatsu hero. Hopefully we get a scene where he declares his intent to not let little kids cry in fear before transforming like any good rider does simillar to the Kamen Rider Kuuga church henshin scene
Despite what some people may say, I love that its imagination that is his power because many a time in Kamen Rider stories the main rider gains power from the belief of other people or himself in fighting for whats right. If im not mistaken it that same king of imagination and childike wonder...