I?m adapting every KR series to date, and commonly end up using concept designs and unique forms.
Zi-O (adapted as Power Rider Time Turner)
Zi-O uses all Primary Rider Armors, Geiz uses all Secondary Rider Armors, and so on (Woz is third, Tsukuyomi is fourth) plus an original sundial Rider who completes the Japanese script theme by using kanji on her visors and gear. As for Rider Armors, she uses any Riders that the other four don't. (Haven?t figured out her weapon tho [Every Rider seems to have a primary weapon])
Final Form Armors end up in a Hyper Battle.
OOO (adapted as Power Rider Medal Scrambler)
First change is fem!Shingo (who survives the first ep without Ankh shenanigans) - plus the now-sisters become Riders along with Chiyoko (SoKaBi), Kousei (ShiGazeShi), and Erika (SeiShiroGin)
(Hina takes the third slot while fem!Shingo takes fourth)