From Halopedia, the Halo wiki
Battle of Installation 04
He was aboard the Truth and Reconciliation during the Battle of Installation 04, and spoke to Orna 'Fulsamee several times. Orna 'Fulsamee found him to be quite tiresome, as he would speak often on the Prophet's behalf and use the royal "we", a habit which greatly angered and flustered Orna 'Fulsamee.  In addition, he believed that the humans arrived not randomly, but rather, they arrived because the humans thirsted for the glory from the greatest of the Forerunner installations, Alpha Halo.
When Zuka 'Zamamee went to the Prophet of Stewardship about personally hunting down the Master Chief, 'Ikaporamee was present again; however this time he didn't speak as a Councilor Elite. Instead, Soha 'Rolamee was present to do the talking. He was not seen again.
Being constantly at the Prophet's side, it is assumed that he died when the Orbital Drop Shock Troopers boarded the Truth and Reconciliation. When they captured the Prophet, the Marines possibly saw Bako as a hostile and killed him, or when John-117 destroyed Installation 04, or in combat with the Flood.
List of appearances