Ian
Ian was the Emergency Engineering Hologram used during the late 24th century by  Cristóbal Rios aboard La Sirena. He was one of several emergency holograms (the others being Emil, Enoch, Emmet, and Mister Hospitality), and appeared in the likeness of Rios, but spoke with a Scottish accent. ()

In 2399, Rios activated Ian to repair La Sirena while it was en route to Deep Space 12. ()

Appendices

Appearances

Background information
Ian was played by Santiago Cabrera.

In an Instagram story dated 13 March 2020, Michael Chabon affirmed that the engineering hologram's Scottish accent was a nod to the character of Montgomery Scott. 
Holograms