Tamaki

Tamaki (環, Tamaki) is one of Fate's many pactio partners and like the rest of the girls she has romantic feelings for him.

Appearance
She has a pair of horns in the sides of her head that can be used to poke people with (as Rakan and Chamo get horned because they notice she doesn't wear panties). According to Akamatsu, she doesn't wear panties because her tail is too big. She is often expressionless, even when put into otherwise embarrassing situations.

Plot
She seems to team up with Koyomi, since their combined artifacts represent time and space. Koyomi is able to stop time long enough for Tamaki to trap people within her artifact. It's revealed that she's from the dragon folk, similar to Vrixho Nagasha (the dragon of the Hellas empire). Dragonfolk are said to be among the most powerful beasts in existence. Kaede, who had past experience fighting dragons in the magic world, seemingly subdued her, but Tamaki emerges from the flames seemingly unharmed, transforming fully into an actual dragon, and joins Homura and Koyomi in fighting Ku Fei.

Abilities

 * Encompadentia Infinita (無限抱擁（エンコンパンデンティア・インフィニータ）, Enkonpandentia Infinīta): Tamaki's artifact. Creates some Dimensional Barrier that can be used to trap foe. The name Encompadentia Infinita means "Infinite Embrace." The space within the dimension her artifact creates is seemingly endless, making it easy for her to hide from her opponent.
 * Dragon Transformation: In this form, Tamaki has some wooden-like wing and a longer, lizard-like tail. Its true skill is unknown, as she and Fate's other Ministra Magi lost to Rakan in just 5 minutes after the girls got serious. Her form is seen again during the girls' battle against Negi in the Gravekeepers palace, where she is seen sporting a much larger horns and a giant tail, suggesting that her true form is much larger than her humanoid form. She can easily crush things with a swing of her tail.

UQ Holder!
Tamaki appears in Chapter 139 of UQ Holder!. In the flashback five years after Asuna returned to the timeline where she started to felt asleep at Mars, helping Negi and Fate to fight against the Mage of the Beginning.

Trivia

 * Her codename, Tamaki, means "bracelet" -- a reference to her unending artifact. Her true name is unknown.