
His notable differences to his siblings have compared to the late children of Prince Rhaegar Targaryen, where his daughter, Princess Rhaenys had Martell amber eyes and brown hair and his son, Prince Aegon had Targaryen sliver hair and violet eyes. He displays "a good amount of intelligence" and has a "natural talent for warfare and fighting". He has one dark blue right eye, and one left eye that "often changes between Baratheon blue and Lannister green" depending on what he wears.

Broad shouldered and muscled, he is described as Robert in his youth, looking every bit a Baratheon. He has thick, black hair like his father. Unlike the rest of his siblings, he is very tall, exceeding Joffrey by a couple of inches since the age of eight.

Tommen is cheerful, Myrcella is sweet, and Joffrey was a prick, looking like a Lannister never made me think any different of them." ―Aegon Targaryen and Ryam Baratheon If any of them were albino, that wouldn't have changed a thing. Joffrey, Myrcella and Tommen, were my family. Arianne ponders whether her plan had been betrayed by Darkstar or by another of her conspirators." When you saw that you had black hair and they didn't, why is it that you never questioned it? Not once did it cross your mind?" Myrcella is taken to Sunspear, where Maester Caleotte saves her life. He escapes Areo's guards by riding into the sands of Dorne. Her horse rears, however, and Darkstar succeeds only in slicing off her ear and scarring her face.

Amidst the fighting, Gerold attempts to kill Myrcella. Gerold agrees since they are outnumbered, but Myrcella's bodygyard, Ser Arys Oakheart of the Kingsguard, rides to his death in an attack on Areo. Īrianne's party is surprised at the Greenblood by Areo Hotah, who orders them to surrender.

Gerold is skeptical of Arianne's plan to provoke Queen Regent Cersei Lannister. At Shandystone, Arianne admits to her other conspirators that she only included Darkstar for his fighting prowess and his keep, High Hermitage. Gerold allies himself with Princess Arianne Martell when she attempts to crown Princess Myrcella Baratheon in place of her younger brother, King Tommen I Baratheon.
