Ryoko Tsunoda er berømt for hendes rolle i børneprogrammet "NHK With Mom", som er i stil med "Sesame Street". Børneprogrammet har kørt på japansk tv i årevis. Hun var en del af udsendelsen imellem 1999 og 2003 og optrådte alle ugens dage. For tiden spiller hun jævnligt "kaptajn" i et andet børneprogram med titlen "Yume rinrin maru (= Ship of Dreams)", hvor hun underviser det yngste tv-publikum gennem sine sange.

Ryoko Tsunodas udtalelse om H.C. Andersen:
"Hans Christian Andersen and his wonderful stories have been part of my life from early childhood. On being nominated to become Andersen Ambassador I once again opened books of his and felt as though I had met a long-lost friend. Most of my current work involves interacting with children. I feel strongly for my job; for being able to interact with the pure and heartfelt feelings of children and their shinning smiles. As Andersen Ambassador, I would like to voice Andersen's message of "Love, Courage, Hope, Dream and Creativity".