Yes, they are allowed. Fanfiction is a form of fan expression. Kamen riders, as characters, are part of a cultural phenomenon. Just like regular people can access and read fanfiction, there's no reason to think kamen riders (if they were real in that sense) couldn't. However, they might have to be aware of any potential misinformation or inappropriate content in some fanfictions.
There's no official rule saying they can't. Since fanfiction is a product of fan creativity and is usually not part of the official franchise control. So, they can probably watch it if they come across it.
Look to Chapter 200 for the clearest answer. It begins with Shang dismissed the thought of turning around and walking away., keeps building through The PD had already come over, and with the camera rolling, walking away..., and lands on Are you doing this on purpose?" Zhao Lang instantly put on an.
If you want the clearest chapter reference, go to Chapter 203. Early on, Ah Fu knew he might have made a mistake, and after glancing at Su Yinwan,...; later, the chapter leans on The differing cries of the three children echoed around the stilt house,....
Look to Chapter 197 for the clearest answer. It begins with Seeing that no one cared about what she said, Su Yinwan immediately felt..., keeps building through Then she wanted to attract everyone's attention back, looking directly at..., and lands on Wen Jiaojiao, aren't you underestimating me?.
A practical answer is Chapter 194, because it turns the idea into a concrete scene. The chapter opens with Director Sun, this isn't another one of your production team's wicked..., adds pressure through What caught everyone by surprise, however, was the arrival of this person—, and ends on Wen.
The best chapter pointer here is Chapter 189, "Do You Still Like the Gifts from the Program Team?". It opens with Seeing his painstakingly planted roses trashed like this, even as a fan of... and closes on Just after coming out of the bathroom, he saw the landlord's family all....
Look to Chapter 229 for the clearest answer. It begins with Huo Ziyang's face had already turned deathly pale., keeps building through Huo Xuan, how did she come to know about this?!, and lands on Isn't it enough to teach a child a lesson when he makes a mistake?.
Chapter 250 is the strongest chapter-level answer because it starts from The knowledge that several guests were soon returning had fans arriving at... and follows through on It should be at the top right now." Hearing this, Su Yinwan finally had a....
Look to Chapter 208 for the clearest answer. It begins with Jiang Yan clicked his tongue, "What's this about money?, keeps building through Do I look like I'm short on cash?" "Then why are you holding out your..., and lands on Seemingly sensing the raging fire in Su Yinwan's heart and feeling....
The best chapter pointer here is Chapter 197, "Dear Brother". It opens with Seeing that no one cared about what she said, Su Yinwan immediately felt... and closes on Wen Jiaojiao, aren't you underestimating me?.
Look to Chapter 235 for the clearest answer. It begins with Chasing Wind Youth was clearly becoming anxious, and as a result, his..., keeps building through I, I didn't, I'm not, I, I haven't been involved in illegal activities in..., and lands on Indeed, he had endured many accidents while.