Vampire

In role play, Tessa's eyes glow red when she's thirsting for blood. The brighter the glow reflects how strong her thirst is. They're dark red in color, and cover her whole eye when they're at their brightest. When she picks up a scent, they flicker. Sometimes she can play it off as a trick of the light when she's hunting. 

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Then there's the basics; increased speed due to Celerity, and keep at it for long periods of time because of high stamina. Since her phone was stolen in a bank robbery, she uses Telepathy to contact others. 

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In the Shadows, Tessa can use them to hide. Since her turning, she's been able to manipulate shadows to hide her like a cloak from view.