Cherry Maruko's grandfather and Xiaoyu's father.

Anyway, I've been watching meatballs recently,

How can there be a bug?

It's not sinister, but it shows the love of Grandpa Maruko and Xiaoyu's father from the side.

Because Xiaoyu's father loves Xiaoyu very much, he has always wanted to record his daughter's growth with the help of a camera. Grandpa Maruko loves Maruko very much. As an adult, he can understand Xiaoyu's father's good intentions, which children don't understand. So he will be very supportive of Xiaoyu's father taking pictures. And the "insidious" you said is the result of the picture from the child's point of view.

This also shows that Grandpa Maruko has such a mature and intellectual side besides the ordinary image of an old urchin, which is also the common feature of many grandfathers. Bring the role closer to the audience.