In Fourzes’ first real appearance in the Kamen Rider OOO Wonderful movie, Gentaro obviously used less gel. He’s just as slapstick though.
It looks like it’s going to become standard that the following Rider series title character will make appearances in the current Rider’s solo movie every year. It’s a fun and random way for them to just drop by for no reason, show off some of the toys kids will beg their parents to buy them for Christmas and then scurry way. These cameos tend to be the characters in a near finalised form for their show, but may have changes since these cameos. Double and OOO had minor sound and visual effect changes and Fourze is no different, except his signature mop is much less wet look.