In JSRF, once the player collects all the Graffiti Souls in an area, you unlock the Test Runs for the area, and upon completion of those, the hidden character for that area. Furthermore, not all Graffiti Souls are available in the level from the very beginning. To make the other Graffiti Souls appear, the player will need to find the Mystery Tape in the area, then once the player has collected it, the player must complete 5 challenges.
- In Jet Set Radio Future, there are 8 Graffiti Souls to be found in each area, with the exception of Sky-Dinosaurian Square, which has 9. This was done to round out the amount of Graffiti Souls to exactly 140.
- Some graffiti is not unlocked through Graffiti Souls; they become available once the player manages to unlock the corresponding character (i.e., the player will need to unlock Poison Jam to unlock Poison Jam's signature graffiti).
- In Jet Set Radio HD, if all of the Graffiti Souls are obtained, the player is rewarded with the achievement "I Got Soul".