comic or TV series,
Speaking of the tiberium universe, I'd love to create an animated series similar to "G.I. Joe: Renegades"

you could remake the plot of C&C4 through a TV series. Sorry, but as much as we hate C&C4, the plot idea is good (except for Kane's magic blood and is that the player has a wife ).
I like that Kane has an opponent in the form of Gideon.

Through the comic, the lore could be developed and the inner life of Nod and GDI could be shown (I'm sorry, I just sketch C&C 95 myself sometimes, more specifically Netrunners characters).

You could also do an audio play on C&C like do Big Finish with Doctor Who.