It is very popular to carve the DIY seal of anime characters on something like soft glue. What's that thing called?

Rubber stamp (especially DIY hand-carved rubber stamp) is a random hand-carved form. Rubber bricks (different from ordinary erasers) are carved with small carving tools in a negative or positive way to form patterns that can be stamped repeatedly.

Carved rubber stamps can be combined with different color stamp pads to create various effects.

Because of the material, the carving time of hand-carved rubber seal is much shorter than that of stone carving and wood carving, and it doesn't need complicated skills, so almost everyone can get started easily, and the performance content of seal is also very arbitrary.

Rubber stamp making was first popular in Japan and Korea, and then spread to Taiwan Province Province. It only became popular in the mainland in 2006.

Rubber bricks are uniform in hardness and hardness, much larger in size than ordinary rubber, and cheaper in cost. They can be carved with ordinary knives, which is much more convenient than wood carving. Moreover, rubber seals are easy to use, and many lovely seals can be carved with more practice. At present, there are many cartoon characters, including characters and cartoon patterns, which is one of the better manual methods.

I hope my answer can help you, and I hope it will be adopted.