R5-D56, also known as B5-56, and often referred to as B5 or Bee, was an astromech droid that was the faithful companion of the former Sith known as The Ronin.  He traveled with the Ronin through the edge of the Outer Rim Territories in the time following the Sith rebellion against the Jedi.  He is featured in the Star Wars: Visions episode The Duel.

• The Ronin and R5-D56 by CRFR787 (link to separate site for description and download).