A shekara ta 2008, Onyango ta fara fitowa a fim a cikin fim din Wanuri Kahiu mai suna "From a Whisper". Tana taka rawa Tamani, 'yar wani dan kasuwa wanda ya koyi cewa an kashe mahaifiyarta da ba ta da dadewa a cikin
1998 fashewar bam a Nairobi, da kuma copes ta hanyar yin rubutu a bango a cikin tunawa shakatawa. An zaɓe ta don Kyauta Mafi Kyawun 'Yar Wasa a Matsayin Jagora a Kyautar Kwalejin Fina-Finan Afirka. A cikin 2010, Onyango ya ba da muryar dragonfly a cikin jerin talabijin na yara "Tinga Tinga Tales".