It is a brush made by tinkering with the mapping pen (initial tool).
The habit is quite strong, and I don't think it's very easy to use.
丸ペン（初期ツール）をいじって作ったブラシです。
癖はかなり強めで、使い勝手はあまり良くないと思います。
Example usage.
使用例です。
Category 1 カテゴリ1
Popular “Material catalog” materials
New materials
Badges
-
MVP ◆This user has contributed greatly to the management of the community, by posting many great responses to the questions asked. Once every three months, MVPs are determined based on the points earned during that period and will be recognized accordingly. -
New Valuable Player (NVP) ◆These are the next-best contributors to the community after MVPs. This is awarded to users who have not yet won an MVP award, based on the number of points they have earned. -
Official Expert ◆Chosen out of all MVP awardees, who are already proof of excellence, this is a testimony of outstanding correspondence in the community. After careful screening, they are appointed by CELSYS and assume their position.Note: Formally called “Evangelists” -
Official Moderator of CELSYS ◆Moderators are official CELSYS staff members who are fluent in Japanese as well as various other languages. Moderators are not experts on the software or illustration, so they are not able to directly answer your questions. However, moderators provide communication and language support to ensure that everyone can smoothly communicate with each other. -
CELSYS official accountThe Official Administrator Account