One of the many AIs Tempo Academy uses to secure the perimeter, Bob is an android who identifies as female. This might be jarring to some, both due to her mechanical nature, and her frame showing no sign of gender what-so-ever, but she has learned to take their doubts in stride.
The rest of team B.I.R.D., (namely Ian, Rick and Dylan) face similar doubts, being in the same situation.
Bob stands around 1.90m tall, and is rather lanky, even for an android.