Cute & Playful:
* Jules
* Jully
* Lisa
* JuJu
* Sissy
* Lil' J
* J-Bird
Cool & Edgy:
* Jul
* Issa
* J
* J-Dawg
* Juicy
* J-Rock
* The J
Unique & Creative:
* Juli
* Lis
* Ju-Ju-Bee
* Julis
* J-Love
* Issa-Belle
Ultimately, the best nickname for Julissa will depend on her personality and preferences. Consider her age, interests, and how she'd like to be addressed by her friends and family.