Basically they are just words that mean something positive:
-giggle (not sure about this either)
Exotic is positive connotations.
Words with positive connotations are those that have happy or good meanings. Some words with positive connotations are joy, gladness, euphoria, excitement, and jubilant.
Yes, they can be negative or positive.
Positive connotations for the word ruler (as in a king, president, etc.) are a leader, diplomat, example to the people, fair, impartial, etc.
Put's themselves first
Positive connotations for odd would be, different, unusual, strange, irregular, bizarre,
clairvoyance divine madness
Innocence, naivety, new life etc.
bobby jack has no leg
The word smelly has a negative connotation. A synonym with a positive connotation might be fragrant.