On the TV anime Zenki, Chisa performed the 2nd ending theme "Sleepless Angels (~Nemurenu Yoru no Tenshi-tachi~)" This song ended episodes #23-38 of the series.
On August 14, 1995 Chisa appeared on a live TV show called Dou Natteruno?! (Yuushoku Banzai). There is a small cooking segment in which Chisa demonstrated how to prepare Tiramisu (a type of Italian spongecake dessert).
Some of Chisa's favorite foods includes cake, sushi, almond jelly and monjayaki (Japanese pan-fried batter with various ingredients).
Some of Chisa's hobbies includes daydreaming, taking photos of foods, theater, moon bathing and aromatherapy.
On the 1 episode OAV Jungle Wars, Chisa performed the opening theme "Jungle de Asobou!" and the ending theme "Boy - Bokura no Yume no Machi e (To the Street of Our Dreams)".
Chisa voiced the lead character Sana Kurata in the Kodocha OAV. The OAV aired in 1995, but the TV series was done by a different company so she did not participate in that.
In the 2 episode OAV Galaxy Fraulein Yuna, Chisa performed the opening theme "Funny Funny Little Girl", as well as the ending theme "Tsukikage ni Oyasumi". In the 3 episode OAV sequel Galaxy Fraulein Yuna Returns, Chisa performed the opening them "Lightning Heart!" and the ending theme "Tsukikage Oyasumi" along with Miki Takahashi, Satomi Koorogi, Akiko Yajima & Yumi Touma. Chisa voiced the main character Yuna Kagurazaka in both OAVs.
Chisa has voiced various characters in Japanese video games including her role as Asuka Kusanagi in Misa no Mahou Monogatari, Chiharu Kasuga in the True Love Story series, Sakura Shinguji in the Sakura Taisen series, Ryoko Subaru in Super Robot Wars Impact and Nanase Rumi in One ~Kagayaku Kisetsu e~.
Yokoyama released a 12-track CD entitled Chisa and The Heaven & Earth Band Live In L.A. on February 26, 1997.
Chisa voiced the roles of both Maya Gosatei and Misanagi on the hit anime, Rurouni Kenshin, and just Misanagi in the 2 episode OAV, Samurai X: Reflection.
Chisa voiced the character Kagurazaka Yuna on the OAV, video game, and radio drama, Ginga Ojousama Densetsu Yuna.
In the 3 episode OAV, Magical Girl Pretty Sammy, Yokoyama performed the opening theme, "Chanto Yume wo Mimasho", as well as the 1st ending theme, "Baka" and the 3rd ending theme, "Mahou no Tobira".
Chisa has made an appearance at many special events throughout Japan such as the "Tokyo Toy Show" on June 6, 1993; the "Seiyuu Doujou" on December 28, 1997; the "Tokyo Game Show Autumn 1998" on October 11, 1998; the "Hobby Expo 2002 at Big Sight" on July 28, 2002 and the "Roudokugeki 'Densha Otoko'" on May 9, 2005.
Chisa co-hosts an ongoing radio show, "Hiroi Ouji's Maruten Cha Cha Cha", with fellow seiyuu Kappei Yamaguchi and the creator of Sakura Wars, Ohji Hiroi.
In the anime, Sakura Wars, Yokoyama along with The Teikoku Kagekidan performed the theme song, "Geki Teikoku Kagekidan", as well as the 1st and 3rd ending theme, "Yume Mite Iyou".
In 1987, Chisa made her seiyuu debut voicing the character Feris in the OAV, Black Magic M-66.
Yokoyama is employed under the talent agency, Banbiina.
Yokoyama's three sizes are 78-56-82.
Chisa stands in at 160 cm (5 feet, 3 inches) tall, weighs approximately 45 kg (99 lbs) and has blood type B.
(when she first heard her voice)
Chisa: I didn't want to see my own anime for about three years. But since I was a little unsure if I didn't watch it, I did. Then I eventually got used to it. Now I think, "Oh, that's my voice." I always thought my voice was cuter, but now I'll accept this.
Chisa: I got accepted for Robot Carnival but it got delayed, so I did Black Magic. That was my first work.
Chisa: My dream when I was in kindergarten was to be a singer or a gymnast. When I was in grade school, it was to be a comedian. Then in junior high, I wanted to be a student in Kinpachi-sensei's class. Next I wanted to meet Lupin.