Beside characters having synergy with certain types (Scoundrels, Jedi, Sith, Ewoks etc), there could also be some characters having synergy when a specific Character is in the Squad.
The bonus may not be big, but noticable.
Examples:
Darth Vader and Grand Moff
Grand Moff Grand Moff’s Attack – Deal Physical damage to one target.
This attack deals 10% more damage for each living ally.
Will do an extra +15 % if Darth Vader is in your squad.
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Tighten the Grip – Empire allies gain 28 Speed. Darth Vader gain 30 Speed instead of 28 if in the Sqyad.
Darth Vader
Inspiring Through Fear – Empire allies gain 27.5% Offense and have a 25% chance to remove 10% Turn Meter on hit. Empire allies gain 30 % Offense instead if Darth Sidious is in your squad as well.
Darth maul gains X defense when savage is an ally, Savage oppress gains X offense when maul is an ally
Ashoka gives anakin (and possibly Rex) Plus X speed, anakin provides Ashoka and Rex with X offense, Rex provides Ashoka and anakin X tenacity
Dooku gives General grevious X counter chance, grevious gives Dooku offense (maybe potency),
Etc etc
Replies
https://forums.galaxy-of-heroes.starwars.ea.com/discussion/47190/a-serious-synergy-supersizing/
Ashoka gives anakin (and possibly Rex) Plus X speed, anakin provides Ashoka and Rex with X offense, Rex provides Ashoka and anakin X tenacity
Dooku gives General grevious X counter chance, grevious gives Dooku offense (maybe potency),
Etc etc