Five reasons I like certain characters:
Their emotions are evident without being theatrical.
They demonstrate a sensitivity - yes, even the male characters.
They're flawed and aware of it.
If they don't have faith in God, they're aware they don't have it all together.
They are unique in some way.
These are simplified and somewhat vague. What can you add from your own preferences?
Father, help me to create characters that set them apart and make them unique and readable, relatable, humanly weak/flawed, and seeking after you. In the Name of Jesus, Amen.