Morishi was a security officer on Babylon 5 and an expert in bombs and explosives.
In early 2260, Morishi investigated the string of bombings committed by Robert Carlson. After investigating the bombing sites, Morishi traced parts of the bombs to an ice mining company on Vega 7. The same explosive was used in a series of bombings on Proxima III. Later, Michael Garibaldi ordered Morishi to investigate the fusion reactor and, indeed, Morishi found and removed the bomb using a maintenance bot minutes before it exploded far away from the station.