Shun Kenzaki is the human identity of Bio Rider, a powerful form of Kamen Rider Black RX from the tokusatsu series Kamen Rider Black RX. As Bio Rider, he gains enhanced agility and the unique ability to liquefy his body, allowing him to evade attacks and infiltrate enemy bases. Shun Kenzaki plays a critical role in combating the Crisis Empire, using his Bio Rider powers to protect humanity and support his allies throughout the series.