Akilah al-Haber is the older sister of Hayat al-Haber, one of Garik Shayk's good friends.
We never meet Akilah, but the role she plays in the story is vital. Akilah used to skate, and she was quite good. Her board was equally good.
Akilah lost interest when other things became more important to her, to her younger brother Hayat's good fortune. He inherited her unicorn-and-fairy-dust longboard with its pink wheels, and that was the magical moment when he began to ride with his Bay City idols at the Connel Street Skate Park. A friendship was formed with Garik, Muhammed, and Ibn, and they have been a close knit team ever since.
We learn of Akilah in Book 1 of The Human-Hybrid Project, Shattered by Glass. Her skateboard returns but it is the last we hear of Akilah.