|Namesake||Yoshi- (prefix used in all Kira's family male names)
-maru (common japanese suffix for male names)
|Birthday||April 16, 2000|
|Favorite Food||Vanilla ice cream|
|Favorite Animal||His pet|
|“||My only goal is "justice"! The day when Morioh reach this... the place will be fulled with "shining justice"...||”|
—Yoshimaru about his goal
Yoshimaru is a young 12-year old boy with a rather scrawny build, having blonde loosely combed back hair with a few strands out of place and hazel eyes. He also has 5 orange-red colored lines on his cheeks that look like whisters.
His clothes are dark blue shorts and a green sweater. He wears a pair of converse shoes and white sox.
Yoshimaru was born from Shinobu Kawajiri and Yoshikage Kira (now named Kosaku Kawajiri), being the younger brother of Hayato Kawajiri.
Yoshimaru was born with blonde hair, which confused both Shinobu and Hayato, but Kosaku just let it slip. Yoshimaru's early life was that of a normal boy.
When Yoshimaru was 4 years old, he was pierced with the Arrow by his father, after this, he awakened his Stand. Hayato tried to teach Yoshimaru to use his Stand (despite being unable to see it).
With the years, Yoshimaru came into believe that Stands are the key of "justice", and only a Stand user will be able to bring "justice" to the world. After that, Kosaku teached Yoshimaru to use his Stand to fight "criminals", so he will be the one to bring "justice" to Morioh.
Yoshimaru has rather odd definition for the word "justice", and usually use a self-created concept: "shining justice". The meanings of these terms according to him are the following:
- Justice: to Yoshimaru, "justice" is doing good acts, stealing and killing are examples of things Yoshimaru thinks are against "justice", and calls the ones who do this "criminals". According to Yoshimaru, only a Stand user can stop the "criminals" and bring "justice".
- Shining Justice: to Yoshimaru, a place with "shining justice" is a place lacking of "criminals", or in other words, a place without evil. Yoshimaru's dream is to fill Morioh with "shining justice", or in other words, freeing it from evil-doers.
- Yoshimaru inherited his father's natural hair rather than Kosaku's.
- Yoshimaru's concept, "shining justice", is a reference to the lyrics of Great Days.