- He once met Nobunaga Shimazaki during 81 Produce's 1st audition on 2007, where they were both finalist during that audition. Almost 8 years later, they would star together in Ore Monogatari!!, where Eguchi played Takeo Gouda and Shimazaki played Makoto Sunakawa.
- In 2017, Eguchi launched a manga about his life called Eguchi Takuya no Gainen Planet, published on Kadokawa's Dengeki Girl's Style Online website.
- During high school, he listened to Masaya Onosaka's radio show which he tuned on during his late night study sessions, and became interested on voice acting.
- He is a part of the trio Trignal with fellow seiyuus Ryouhei Kimura and Tsubasa Yonaga and host Radio for Kiramune label, and with fellow seiyuu Yuuki Ono in Team YouTak.
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