Seguchi Leiya was born on March 11, 1996 in Fukuoka Prefecture, Japan.
Since his mother works in an entertainment agency, Seguchi has been working as model since childhood, appearing in local CMs. When he was in high school, he watched an episode of OKAXILE and was shocked at how well EXILE were performing. He then started to attend EXPG classes in his hometown, Fukuoka. When he was 18 years old, he moved to Tokyo to dedicate himself even more to become a performer and transferred to EXPG Tokyo.
-  4-gatsu no Kimi, Spica.
- Main article: Seguchi Leiya/Gallery
|Gallery | Category | Songs navbox|
|Members||Sekai (L) | Sato Taiki (L) | Sawamoto Natsuki | Seguchi Leiya | Hori Natsuki | Kimura Keito | Yagi Yusei | Nakajima Sota|
|Honorary Members||Nakao Shota|
|Albums||1. FANTASTIC 9|
|Other Albums||BATTLE OF TOKYO ~ENTER THE Jr.EXILE~|
|Singles||1. OVER DRIVE | 2. Flying Fish | 3. Dear Destiny | 4. Time Camera | 5. Hey, darlin' | 6. Winding Road ~Mirai e~ | 7. High Fever|
|Concerts & Tours|
|Tours||1. FANTASTIC NINE | |
|Concerts Featured In||EXILE: STAR OF WISH|
GENERATIONS: SPEEDSTER | MAD CYCLONE
Other: BATTLE OF TOKYO ~ENTER THE Jr.EXILE~ | LDH PERFECT YEAR 2020 COUNTDOWN LIVE 2019▶︎2020 "RISING"
|Units & Other Acts|
|Associated Acts||EXILE TRIBE | Jr.EXILE|