What unit (if any) promotes to Fusilier, or is it the first of the gunpowder units?

[MIS]

I'm playing Ethiopia and wondering what line (if any) leads to an UU upgrade.

 

[Rekk]

I'm playing Ethiopia and wondering what line (if any) leads to an UU upgrade.

Tercio, which upgrades from Longswordman and Pikeman.

 

[Stalker0]

Longsword/Pike -> Tercio -> Fusilier -> Rifleman -> Infantry -> Mech Infantry

 

[Anarcomu]

Looking at the title, I'm just going to make clear that melee units (from ancient era to renaissance) upgrade to gunpowder unit (from industrial era onward). There is no broken line there.