The Albinoleo Imagin is Kai's subordinate, a stronger white version of the Leo Imagin. Sent to kill Airi Nogami, he easily overpowers Den-O Liner Form and Zeronos Zero Form until elder self of Sakurai arrives, turning the tables. After being pummeled by the trio of Riders, the Altair Form and Zeros Form leave the Albinoleo Imagin open for Liner Form's DenKamen Slash, which destroys him.
To be added
Kamen Rider Decade: All Riders vs. Dai-Shocker
Albinoleo Imagin revived again and be part of Dai-Shocker.
OOO, Den-O, All Riders: Let's Go Kamen Riders
Representative of the Imagin alongside Shocker in Let's Go Kamen Riders' altered timeline.