Positive:
* A real personality: Emphasizes their vibrant and unique nature.
* One of a kind: Highlights their individuality and distinctiveness.
* A colorful personality: Implies a lively and entertaining presence.
* An unforgettable presence: Suggests they leave a lasting impression.
* Full of life: Indicates they are energetic and enthusiastic.
* A true original: Emphasizes their unique and creative spirit.
* A force of nature: Indicates they are powerful and dynamic.
Neutral:
* An interesting person: A more general and neutral way to describe them.
* A unique individual: Focuses on their individuality and distinctiveness.
* A memorable figure: Highlights their lasting impression.
* A bit eccentric: Suggests they are unconventional and possibly quirky.
Negative:
* A bit of a handful: Indicates they are difficult or demanding.
* A real handful: A stronger version of "a bit of a handful."
* A bit of a wild card: Suggests they are unpredictable and unreliable.
* A bit of a troublemaker: Implies they are prone to causing problems.
The best alternative will depend on the specific context and the impression you want to convey about the person.