This is the Japanese martial arts Aiki O'Kami.

The Aiki (合気/合氣) means harmonious energy. While Okami or O'kami (大神) means great spirit.

You will usually see this title written as 合氣大神, though in modern Japanese (after 1945) the second character, 氣, was simplified to 気 in Japan (and 气 in China). I suggest you use 合氣大神, but please let me know when you order if you would prefer 合気大神 instead.

アテナ is the name Athena in Japanese.

Note: Because this title is entirely Japanese Katakana, it should be written by a Japanese calligrapher.

雅典娜 is a common way to transliterate the name Athena into Mandarin Chinese.

ケミ is the name Kami in Japanese.

Note: Because this title is entirely Japanese Katakana, it should be written by a Japanese calligrapher.

卡米 is the name Kami transliterated into Mandarin Chinese.

川の神 is the title of Kawa no Kami - a River deity of Japanese folklore.

神 is the simplest way to write spirit in Chinese, Japanese Kanji, and old Korean.

This single character alone will conjure up ideas of the spiritual world. 神 can also be translated as “vital awareness” as in the fact that one must know they exist to exist (I think, therefore, I am).

Other translations include:
God, deity, mysterious, divine essence, lively, spiritual being, divinity, supernatural, soul, mind, nerves, and energy. In some extended context, it can mean genius or unusual.

Japanese romanizations vary a lot when this character is combined into other words. However, shin is the original pronunciation taken from Chinese into Japanese. You'll also see it romanized as kami, gami, jin, and a few others, depending on context.

貓神 is the title Nekogami or “Cat God” in Japanese.

This can also be pronounced “neko shin” or “neko kami.”

猫神 is the modern Japanese version, before WWII, this would have been written 貓神 (just the first Kanji varies).

This also makes sense in Chinese, though the traditional version, 貓神, would be better for Chinese calligraphy.

天狗 is the Japanese title for Tengu, which roughly translates as “heavenly dog.”

Tengu is a type of legendary creature found in Japanese folk religion and is also considered a type of Shinto god (kami) or yōkai (supernatural being).

The origin is Chinese, though this term is seldom used in Chinese anymore. It was a dog-like Chinese demon (Tiangou)

Although the title contains the word “dog,” the tengu are often depicted with human and bird-like characteristics. Sometimes they have large noses or beaks like birds.