Fun facts: He is near-sighted, sometimes he wears glasses. When he was younger, he played soccer. He likes he's adam's apple on his body, he thinks it is very masculine. He doesn't like his hands, because they are rather small, and it is difficult to play on the guitar with small hands. He likes sleeping in bed instead of doing it on a futon. He needs complete darkness to sleep. He follows every new fashion. His favourite parfums is Egoist Platinum and CK One; his favourite piece of clothing is jeans; his favourite season is autumn.
When Kaoru was young, he got bored with his original black hair and he began to slowly brightening it to brown. When his parents noticed the change and asked him about it, he told them that the chemicals in the swimming pool were causing it, which is funny, because Kaoru can't swim.
Like Kyo, Kaoru has many tattoos too.

K>aoru is the oldest of the group - and as one, he appears to be the most mature - and he is the stoic leader-sama; all of the other members look up to Kaoru in a way. He is the main composer for most of their songs, and an excellent one at that; because every Diru song is different, so he must have an amazing imagination to come up with so many different musical variations. His guitar skills are positively astounding too, he holds his audience captive through his playing.

He rarely smiles - though when he does, it's a definitely heart-warming sight. However, he was the one member of the group who scared all the others when they first met. You can imagine, even the Waru was scared of him! Also he is quite serious and very deliberate. But as adult-like as Kaoru appears - he has a sweet, childish side that he shows sometime: he is a big fan of anime and manga (especially Gundam), and loves to tease Shinya with Die, or simply to joke around.

On concerts, Kaoru remains relatively still, but sometimes he just runs around the stage and pumps the crowd up. He is also famous for headbanging along to the music. He was a very big fan of Hide, he even joined one of his fanclubs, sent him a letter and got an autograph! Altough he dislikes to admit it, he is very good at drawing. He likes sports like soccer very much, not like sport-hater Shinya.

In the band's VK days, he wore a lot of black that rarely showed much of his skin. His clothes looked comlex (and sometimes bizarre, like the parasite hat O_O), and he tried to create his clothes as strange as possible, so nobody can copy them. It was nearly impossible to make out the details on his black clothes from the photos, so Kaoru would've really appreciated if someone could find out the detailed design and cosplayed perfectly. But usually he created his clothes in a way he doubt someone would've been able to make them absolutely the same as his.

Kaoru wrote the music for:

• Ash
• 惨劇の夜「Sangeki no Yoru」
• Unknown... Despair... a Lost
• 秒「」深「Byo 「」 Shin」
• Cage
• 蜜と唾「Tsumi no Batsu (Mitsu to Tsuba)」
• Mazohyst of Decadence
• Mask
• 残「Zan」
• アクロの丘「Akuro no Oka」
• 霧と繭「Kiri to Mayu」
• Hydra
• Berry
• MACABRE - 揚羽ノ羽ノ夢ハ蛹 -「Macabre - Sanagi no Yume wa Ageha no Hane」
• ザクロ「Zakuro」
• 太陽の碧「Taiyou no Ao」
• Hydra Buzzout Mix
• 太陽の碧-Mix-「TAIYOU NO AO -mix-」
• Zomboid
• Embryo
• 逆上堪能ケロイドミルク 「Gyakujo Tannou Keloid Milk」
• 蟲「- Mushi -」
• Jessica
• 鴉「- Karasu - 」
• アクロの丘 "K.N.Y.Mix"「Akuro no Oka "K.N.Y.Mix"」
• Cage >|< Mix
• JESSICA (Demo)
• Hydra (Live)
• 逆上堪能ケロイドミルク（plucking:Mr.NEWSMAN）-NEW JAP MIX-「GYAKUJOU TANNOU KELOID MILK (plucking:Mr.NEWSMAN) -NEW JAP MIX-」
• Embryo (Single ver.)