How about buying your original "portrait stamp"?

Ordinary stamp looks quite stiff, don't you think so?
It is good for business use, but some people want more casual ones for private use.

Here is my recommendation.
"Your portrait stamp" by Honkoya (ハンコヤ).

A Japanese traditional stamp with your portrait on it drawn by a professional illustrator.

1. Just send your seflie and your name to Honkoya company.

It is simply 4 steps to get nice and cute original stamp.

You can buy it for yourself to enjoy.
And also it is good as a gift.
For example, as a gift in celebration of the birth of your friend's child.

Compared with western countries, Japan is so "Stamp" based culture, not signature.
You may not use stamps a lot in your life, but I think you can buy them for fun or as a gift!