Watch movies, cartoon or anime and read manga or comic books.
In these media abstract concepts are represented in a concrete way. You can make phantasmas out of a character based on:
- Ability
- Personality
- Name
- Background history
- Apearance
For example, Rufus Lore from fairy tail says memorize everytime he memorizes something. Knowing this you can now use Rufus Lore for the word memorize or anything that has to do with memory. Or you might use Gray as phantasma for the word Freeze
