Goths are a AoK civ, and huns are a AoC civ, both are there since more than 20 years and won’t go anywhere.
As why they were chosen, the devs more than once stated than when deciding what civ to introduce, they look at 2 things:
- how much one civ interacted with the others already in the game
- do this civ have evocative and cool history, leaders, or moments?
The huns in particular were introduced for how evocative was the name ho Attila. Goths instead initially should had filled the barbarians that settled the iberian peninsula, and to some degree the Italian peninsula too and britannia (saxon aren’t goths, but goths have huskarls) since at the time there weren’t spanish or Italians.
This made actually sense, as during the late antiquity and high medioeval period, goth, romans/byzantines and franks dominated europe, and the huns or other tribes like the avars dominated the european steppe.
Goth have gunpowder because they initially were meant to represent spanish too, and later on kept it as it’s their only answer to enemy champs, alongside scorps.
Although vandals were for sure the culture that dealt the killing blow to the WRE (if ravenna kept carthage and africa it could very well eventually counter attack and stabilize) their impact on the world beside that was very small, as after gaeseric died, it didn’t matter very much anymore.
The lombards were actually the first forgotten civ to be released, and renamed Italians after. To be fair right now lombards would be more fitting, even if the term italian probably evocate the renaissance period better…
Fun fact, at that time the western part of the empire was still considered to be the strongest half, and the battle of adrianopole proved it.
The visigotic kingdom is considered the first spanish kingdom, and on the ashes of the visigotic kingdom will reborn the moder spanish and portoghese that we know.
As for lombards, it was their invasion in the Italian peninsula that prompted the birth of an early italian culture, that was finally separed by the roman heritage, as roman and germanic culture start to mix in.
Ostrogoth on the other hand, while had the strongest roman-barbaric kingdom, had little impact on the Italian history, as giustian made sure that to that.
But with centuries between one and the other.