An extra-dimensional Sunpyre appeared as part of Big Hero Six. Fellow teammate Honey Lemon pulled Sunpyre out of Lemon's Power Purse, resulting in Sunpyre worshipping Honey Lemon as a goddess and Sunpyre joining the team. Sunpyre and Ebon Samurai were both created to fill in the void left by Sunfire and Silver Samurai, who were being used elsewhere at the time.
Solar Flare: Lumina's powers enable her to absorb solar and other radiation to generate the process of ionized matter (usually air) through a mentally-triggered unknown biochemical process so that it is converted to plasma, the superheated state of matter. Plasma is the state in which matter making up the sun exists; hence, Sunpyre refers to her projecting “solar fire”. Hence she can sheath her body in flame. 
Flight: can use her powers to create super-heated air currents which push her forward through the air, enabling her to fly. Sometimes this super-heated air is visible as a trail of flame behind Sunpyre. The upper limit to the speed Sunpyre can achieve in flight is not yet known, although it is known to be greater than that of the Angel, who can reach 150 miles per hour.
Plasma Blasts: ability to project the flames she generates at powerful blasts of energy. 
Plasma Emanation: Sunpyre can generate plasma temperatures which match those that can be generated by the Human Torch, reaching about 1,000,000 degrees Fahrenheit at maximum level. She can also use her power in a massive blast similar to Johnny Storm's "Nova Burst". However, Lumina has much more control over the area of effect, enough to where one person may feel like they have been sunbathing all day to total incineration of another target.
Heat Signature Sense: ability to sense beings by the heat signature that they give off.
Plasma Shield: ability to manipulate the plasma around her to form an aura that can melt incoming bullets are stave off other attacks.
Solar Shielding Psi-field: She is protected from the radiation she emits by a short-range psionic force field which automatically comes into being whenever air friction, and also prevents excessive amounts of light from the plasma from reaching her eyes so as to blind or damage them. Sunpyre's body emits a protective field whenever she uses her powers. However, it is speculated that she can generate power in excess of her natural protection.
It was revealed in the updated handbook entry in Big Hero 6 #1 that Sunpyre's real name was Lumina and she was originally from the Microverse world of Coronar.