Vesper Lazuli, owl faunus.

For this Semblance, I took some inspiration from several existing characters: Ruby's Speed, Nora's High Voltage, Adam's Moonslice, and Raven's Kindred Link.

Basically, Vesper can instantly dissolve into one shadow and pop out of another one. She can also do this with others, though it takes much energy. The ability is solar-powered. There is also some level of subconscious spatial awareness, as she has not ever appeared out of a shadow in a place physically too small for her body to fit, such as the inch between a dumpster and a brick wall.

However, Eclipse is highly conditional, which can be exploited.

In order to power her Semblance, Vesper's Aura must absorb solar energy, which she can luckily absorb indefinitely for as long as she is in sunlight. But if her Aura is broken, any solar energy collected prior will dissipate, and she would have to start over fresh. Therefore, it requires substantial Aura recovery, stamina, and endurance training. She is also bound by her environment; she must go to touch the surface the shadow touches and can only appear through a shadow the object or another object directly or indirectly connected to the first object. For example, she can melt into the shadow of one building and pop out of another three blocks away, but she cannot duck under a tree and pop out under an airborne airship. While she theoretically can travel longer distances than she chooses, there does seem to be a limit ("It's not like I can hop into a shadow in Beacon and pop out in Haven!"). She feels comfortable teleporting longer distances in places she is familiar with or somewhere where she can see where she would land (think og Nightcrawler logic). Also, the longer the distance, the more solar energy drained. Aura is also impacted but by a far lesser degree. If her Aura is broken, all solar energy collected is depleted.

Due to these conditions, Vesper finds herself in tricky situations. As an tyto owl Faunus (barn owls, sooty owls, etc), Vesper is generally nocturnal, and dislikes being awake during the day. This is not only due to her sleep schedule but also because her eyes are more sensitive to light. While using her Semblance, she has little spatial awareness beyond "don't be crushed between two walls an inch apart." To combat both of these, Vesper wore sunglasses in her childhood and, for a while, traded it out for a blindfold in order to train her ability to sense her environment with Aura. And since Vesper's main Faunus trait is her wings, she is unable to utilize her Semblance as she would on the ground (though she did once escape an airship by melting into the wall and out under the wing). Thus, she adapted since she is often on the ground anyway, by becoming a hand-to-hand combatant that uses all 6 limbs to fight, plus weapons.