The Senate of Burundi includes three representatives of the Twa ethnic minority, who are co-opted rather than elected.
On 9 August 2005 Charles Masabo was co-opted to serve as Twa senator for the province of Kirundo.
[3] In August 2007 the Secretariat of the Convention on Biological Diversity listed him among the beneficiaries of the Voluntary Trust Fund that provided financing so he could attend WGABS-5 and WG8J-5 meetings in Montreal, Canada in October 2007.
[4] In 2008 he served on the United Nations Permanent Forum on Indigenous Issues, contributing to implementation of recommendations on the six mandated areas of health.
[5] As of February 2024 the United Nations Global Framework on Chemicals listed Masabo as an NGO focal point, coordinator for UNIPROBA.