C3PO appears every episode: 1-6 and also 7-8.
So.. I think it must be C3PO’s Journey not legendary event.
And it could be requiring more than 5 characters.
C3PO: Light Support Republic Droid Rebel Resistance
Tier 1 — ep1
Qui Gon Jinn
Jedi Knight Anakin
R2-D2
w/ C3PO
Tier 2 — ep2
Jedi Knight Anakin
R2-D2
Padme ( marquee or legendary )
w/ C3PO
Tier 3 — ep3
General Kenobi
R2-D2
w/ C3PO
Tier 4 — ep4
Farmboy Luke Skywalker
Obi-Wan Kenobi (Old-Ben)
R2-D2
w/ C3PO
Tier 5 — ep5
Princess Leia
Han Solo
R2-D2
Chewbacca
w/ C3PO
Tier 6 — ep6
Commander Luke Skywalker
Han Solo
Princess Leia
R2-D2
Chewbacca
w/ C3PO
In ep7,8... c3po’s importance is really low.. so.. ep1-6 could be nice...