Ryota Yamaguchi (山口 亮太, Yamaguchi Ryōta) was a writer for episodes in the fourth and fifth seasons of Sailor Moon. His first episode was episode 130 and his last episode was episode 200.
Other animes he has worked on include DokiDoki! Precure, Ranma 1/2, The Vision of Escaflowne, and the original Hunter x Hunter series.
- Episode 130 - Protect a Mother's Dream! The New Attack for Double Moon
- Episode 134 - Makoto's Friendship! A Girl Who Adores a Pegasus
- Episode 138 - Drive to Heaven! Love Riding on the Car of Dreams
- Episode 141 - Storm of Love! Minako's Grand Two-Timing Plan
- Episode 144 - Sparkling Summer Days! Ami, the Girl in the Ocean Breeze
- Episode 147 - The Fated Partner? Makoto's Innocence
- Episode 151 - True Power Explodes! Ami's Song of the Heart
- Episode 154 - Confrontation in Dreams! Minako and Makoto's Broken Friendship
- Episode 157 - Pegasus is Gone?! Swinging Friendships
- Episode 162 - The Center of the Darkness: Dead Moon Circus
- Episode 167 - A Nightmare Scatters the Flowers! Return of the Dark Queen
- Episode 170 - The Fateful Night! The Agony of the Sailor Senshi
- Episode 171 - For the Sake of Love! Endless Battle in the Evil World
- Episode 172 - Moon Love Power! The End of the Nightmare
- Episode 173 - A Goodbye and an Encounter! The Destiny of Flowing Stars
- Episode 176 - Fighter's True Form! A Shocking Super Transformation
- Episode 178 - Luna Saw It! The True Idol Yaten
- Episode 182 - Invasion from Space! Siren Comes Flying In
- Episode 184 - A Night for Just Us! Usagi's Pinch
- Episode 187 - The Power of a Shining Star! Chibi Chibi's Transformation
- Episode 191 - When a Light Butterfly Dances in the Air! Premonition of a New Wave
- Episode 193 - The Silver Crystal is Stolen! Princess Kakyu Appears
- Episode 194 - Holy War in the Galaxy! Sailor Wars Legend
- Episode 197 - Ruler of the Galaxy, Galaxia's Threat
- Episode 199 - The Light of Hope! Final Battle for the Galaxy
- Episode 200 - Usagi's Love! The Moonlight Lights Up the Galaxy
- His birthdate is March 2, 1969, making him 45 years old.
- His blood type is O.