The man was just walking around the woods holding a lantern a loft but he also seemed to be giving off a light of his own. The mysterious woman was effortlessly guiding the people following her through the maze. The boy with white hair and eyes shy’d away from the cleric when she said she hunted the undead
         Sorcerer’s themselves are rare (please note this if from the PHB they may or may not be rare in your world) But wisp sorcerers are the rarest of them all. Wisp sorcerers are rarely born they come into existence by something going wrong with reviving them from the dead or by curses by malevolent beings. 

Wisp origins table

Wisp sorcerer origins: r1d8:
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1: you were a wisp that was experimented on to try bringing you back to life.
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2: you were killed by a wisp but something happened when you were being brought back as a wisp.
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3: you were created by a malevolent fairy to trick people into their doom.
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4: you were cursed by a powerful arch druid to forever wander the world.
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5: you pursued this path to become what you are.
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6: someone tried to wish you back to life but botched the wording of their wish.
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7: a deity created you for a special purpose but never told you what that purpose was.
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8: one or both of your parents were a shadow magic sorcerer and you were the outcome.

Unnatural Life

1st-level wisp sorcerer feature

           You gain the undead type but also keep your previous creature type as well, you no longer need to eat, sleep, or breath. Because you’re more spirit than flesh you don’t decay. (Out of game You keep your old creature type in order to heal and get effected by humanoid spells. In game because you are a combination of spirit and body)

Wisp Magic

1st-level wisp sorcerer feature

           You learn additional spells when you reach certain levels in this class, as shown in the wisp spells table. Each of these spells count as a sorcerer spell for you, but doesn’t count against the number of spells you know.
            whenever you gain a sorcerer level, you can replace one spell you gain with this feature with another spell of the same level. The spell must be a necromacy or evocation spell from the sorcerer, warlock, cleric spell list.

Wisp spells
Spell list:
1st: shocking grasp, dissonant whispers, chromatic orb
3rd: invisibility, spiritual weapon
5th: blink, spirit shroud
7th: hallucinatory terrain, confusion
9th: antilife shell, greater invisibility

Follow the light

6th-level wisp sorcerer feature

            Your light can lead yourself and others to their destiny be it a benevolent destiny or a malevolent destiny. You are able to cast the spell **find the path** at will though not indefinitely. 
             you can use this feature a number of times equal to your proficiency modifier.

Consumption of life

6th-level wisp sorcerer feature

             As an action You can expend a number of sorcery points as you wish on a dying or creature that died within a minute (if the creature is dying they need to make a charisma saving throw against your spell save dc) in order to regain a number of d6s equal to the amount of sorcerery points spent health. ( please note This does not work on constructs or undead.)

Ethereal flight

14th-level wisp sorcerer feature

             You are no longer bound to the earth (or what ever world you’re on) as you become more like a spirit. You gain a flying speed (hover) equal to your walking speed and can move through objects at will however if you stop within an object you take 2d10 force damage ignoring resistance or immunity to force damage.

Ethereal jaunt

18th-level wisp sorcerer feature

              You have gain the nature of a spirit able to pass through the mortal and ethereal planes. As a bonus action You can jump into the ethereal plane up to a minute concentration.

        you can do this up to a number of times equal to your charisma modifier. And replenishes upon taking a long rest.