Mike Echols was a commercial transport passenger in the 24th century.
In 2328, the SS Wisconsin ferried him from Triskelion Orbital Station to Talos IV. His passenger manifest was accessed by Lieutenant Commander Data aboard the USS Enterprise-D in 2370 by reviewing this data in the commercial transport database. (TNG: "Inheritance", okudagram)
This character was only mentioned in writing.
Echols was named after TNG background actor and stand-in Michael Echols.