Float is part of a group of renegade robots, along with Flint and their leader Double, introduced in Spark the Electric Jester 2. Her group was hired by Freom to kill Fark.
Float is confident in herself, that sometimes displays in cockiness. However, she apparently has no real reason to fight, according to what both she and Flint say during their conversation before Castela Blanca. She has a soft spot for Flint. This softness may have been extended to Fark as well. She didn't want to kill Fark.