Kindness and Compassion:
* Kind
* Compassionate
* Empathetic
* Thoughtful
* Generous
* Caring
* Warm-hearted
* Tender
* Gentle
* Sympathetic
Positivity and Pleasantness:
* Cheerful
* Optimistic
* Pleasant
* Friendly
* Charming
* Likeable
* Agreeable
* Easygoing
* Uplifting
* Positive
Manners and Behavior:
* Polite
* Courteous
* Gracious
* Considerate
* Respectful
* Well-mannered
* Charming
Other:
* Innocent
* Naive
* Cute
* Adoring
* Loving
* Delicate
* Soft
* Pure
* Wholesome
Remember: The best adjectives to describe a sweet person will depend on the specific qualities you want to highlight.