|Species:||B1 battle droid|
- "Look, it's RB-551."
"No wonder he got blasted. He's one of those older models programmed by a central computer."
"Not like us; we're independent thinkers."
- ―Battle Droids
RB-551 was a B1 battle droid manufactured by for the Confederacy of Independent Systems. RB-551 was part of the invasion of the Twi'lek homeworld, Ryloth, and was destroyed during an early battle. Later, a patrol of Battle Droids found his remains and considered themselves to be above him. However, they were destroyed immediately after by Syndulla's freedom fighters.
- Liberty on Ryloth (First appearance) (Director's cut) (Head only)