The name Artist Symbols in Chinese / Japanese...

復仇者 is a Chinese title that means avenger or taker of revenge.

The first two characters literally mean avenge, vengeance, reprisal, or revenge.

The last character is a way to say, person. This last character is like adding -er or -ist to subjects like write and art to get writer and artist.

不拘一格 is a Chinese proverb that speaks of exploring different styles and not being stuck in conventional thinking.

It can also be translated as “not sticking to one pattern” or “not limited to one type (or style).” The most simple translation is “being creative” or “unbridled creativity.” Some may also say this means “not being stuck in a rut,” in the context of a designer or artist.

If you translate this, the first two characters mean “not stick to” or “not confine oneself to.”
The second two characters mean “one mode,” “one pattern,” “one form,” “one style,” or “one rule.”

〇 is the famous Enso symbol, which you will see widely used by Japanese Zen Buddhists.

In a twist, I am starting to see Enso used more and more by Chinese Buddhists.

Here is the typical appearance of Enso artwork by Japanese calligrapher Kougetsu.

Enso is not a Japanese Kanji character. It falls more into the category of a symbol. There is some debate, but many consider Enso to be a religious symbol.

Some call this “The Circle of Enlightenment.” Others call it the “Infinity Circle.” If you actually took the meanings of the two Kanji (円相) that make up the word “En-so,” you could read it as “Mutual Circle” or “Circle of Togetherness.” I think the Enso symbol can simply mean different things to different people. Therefore, you should let it have the meaning that you perceive.

The appearance of your Enso will be determined by the artist's personal style, feeling, mood, etc.

武道家 is a Japanese word that means martial artist.

島成園 is the name Shima Seien (1892–1970), a nihonga artist in Taishō and Shōwa Japan.