Tula (Atlantean Tυλα) was an Atlantean and the object of Kaldur's affections. A former star student at the Conservatory of Sorcery, she eventually adopted the alias Aquagirl and joined the Team. Her death on a mission took a heavy toll on Kaldur, and served as the impetus for Nightwing's plan to create the façade of Kaldur's betrayal to infiltrate the Light.
Tula resembles a Caucasian teenager with ruddy hair, aquamarine eyes and a slender build. Her hair is worn in a pixie cut with longer bangs framing her face. She wears a skintight, light yellow tank-top that bears her midriff, with aquamarine hemming in a pattern resembling a low neckline and around the edges. Around her waist she wears a short sarong-like cloth fastened with a ring with the end of the cloth hanging to her front. On her forearms are light yellow, short, fingerless, formal gloves while on her ankles and feet she wears what resemble light yellow yoga socks. She also wears an aquamarine choker around her neck.
When Kaldur returned to Poseidonis for a dinner with the royal family, he invited Tula as his guest. She eventually told him about her relationship with Garth, and the two reconciled during an attack on the city lead by Black Manta. Protecting the Queen, and Poseidonis, Tula took part in the battle, but was wounded when taking an electric blast for Garth. She later recovered.
At the Conservatory, Tula and Garth greeted their old friend Kaldur'ahm, who introduced Miss Martian and Superboy to them.
Poseidonis September 6, 19:27 UTC-2
Garth and Tula explained what had happened to Topo: he was attacked by purists, a group of Atlanteans who wished to rid Poseidonis of all "fish-heads". During their conversation, they witnessed an altercation between their classmates from the Conservatory and Ronal and his friends. After Kaldur, Garth and Tula threatened to use their magic, each group went their own way.
The abduction of Queen Mera had left the kingdom in uproar. Prince Orm led the search, sending Kaldur, Superboy and Miss Martian after a tip that the purists were held up in the trench. Garth, Tula and the other students followed them, and could provide assistance when the tip turned out to be an ambush. Ocean-Master's magics weakened Aqualad and the other "impure" Atlanteans, but Garth and Tula were unaffected. Tula proposed going after Ocean-Master with Garth, but Lori Lemaris objected, as this would only feed the purists' misconceptions about the "impure".
The group eventually tracked Ocean-Master to a nearby cave. They attacked, but Ocean-Master could beat them off with the magic he had absorbed in his trident. Garth summoned the power of the Tempest, which overpowered Ocean-Master. With his magics gone, the villain was forced to retreat.