Suggestion: Allow a low level player to participate in a thread with a high level player at a 3/4ths the higher level player's power level. This would require an agreement between the two players, but it could be done anywhere, allowing lower-PL characters to participate in roleplays with higher-PL characters.
For example, let's say Goku fights against Frieza. Krillin, Piccolo, and Gohan Z-Assist Goku, allowing them to fight more evenly against Frieza, even if he is still much stronger than them. Goku began the thread at around 180,000. Krillin, Piccolo, and Gohan Z-Assist Goku, and thus their effective PLs (not actual PLs) for this thread change to 135,000. When the thread is over, their PLs revert to what they were before, plus the PL reward for the thread.
For example, let's say Goku fights against Frieza. Krillin, Piccolo, and Gohan Z-Assist Goku, allowing them to fight more evenly against Frieza, even if he is still much stronger than them. Goku began the thread at around 180,000. Krillin, Piccolo, and Gohan Z-Assist Goku, and thus their effective PLs (not actual PLs) for this thread change to 135,000. When the thread is over, their PLs revert to what they were before, plus the PL reward for the thread.