Mick, designated as INS-444, was a droid who collaborated with Buffy, the CLE-004 window cleaning droid, on the planet-wide city of Coruscant. These two droids were responsible for putting in a new bedroom window in Senator Padmé Amidala's apartment, after Zam Wesell's assassin droid and Obi-Wan Kenobi caused the original one to be shattered.
Pablo Hidalgo from the Lucasfilm Story Group has pointed out that the window installation droid has a label written in Aurebesh that says "Mick," but it's too tiny to see when watching.