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Heisei Kamen Rider Series Phase 1 (平成仮面ライダーシリーズ第1期 Heisei Kamen Raidā Shirīzu Dai Ichi-Ki?) known in the Western fanbase as the "Heisei", was the previous subsection of the first era of the Kamen Rider Series, the Heisei period. This era refers to Kamen Rider Kuuga all the way to Kamen Rider Decade, which after that would start the Heisei Kamen Rider Series Phase 2 starting with Kamen Rider W.
While, the Heisei Series Phase 1 has hardly any traceable trends it contains infrequent appearances of various elements that would become more prevalent in the Phase 2 Series i.e. the use of mecha and support robots. It also began frequently had Riders have multiple forms an element that was only used sparingly in the Showa era. And it would also begin the trend of Riders having forms where their abilities are often pushed to their maximum potential known as Final Forms.