Here’s a new advantage from Bulletproof Blues third edition (currently under construction): Sidekick!

Sidekick

The character fights more effectively when they fight alongside their mentor. If the sidekick is within short range (10 m) of their mentor, their attack value (AV) and defense value (DV) are equal to their normal values, or one less than their mentor’s values during that turn, whichever is greater. The character’s mentor must be chosen when this advantage is purchased, and should change very rarely, if ever.