For this ask, I drew them approximately what they looked like when they died. I think they would keep relatively the same appearance, except for major injuries healing and just generally looking less... dead-y. Anyway! Here goes! I just answered this for the major chars on my blog that have an Opinion™.
Both Franks admire him a lot. The Franks really coveted the status and glory that Rome had, and wanted to replicate that in their own way. This of course peaked with Charlemagne and the Carolingian Empire. Salian Franks admires Rome a bit more than his twin. The Salian Franks were highly involved with the Romans after all, and so Chlodio got to see him personally quite often. He doesn’t hold a grudge about the conflicts between them; he came out on top anyway. To both of them, it was just tit-for-tat. Ripuarian Franks likes him too, but has always done things a bit more his own style.
The Hasding Vandals were one of Rome’s main antagonists in the 5th century. He picks on everyone, but especially liked picking on Rome since the reward (gold and also his ire) was a lot more enticing than a lot of the people he’s picked on. Even though Vandals is dead now, his view hasn’t changed much. He thinks Rome is entertaining, but doesn’t take him seriously. Mainly he’s just salty that East Rome came back years later to ruin his fun. He just doesn’t really care much for complicated relationship drama, hence the reluctance to give his opinion. Siling Vandals didn’t have much to do with west Rome, until he’d gotten his shit wrecked by Visigoths and had to join up with his stronger twin. So, he’d probably just repeat whatever Hasding has to say about Rome.
Burgundians... well, it’s complicated. If asked, he’d just say that he likes Rome’s strength of character and his conviction. He couldn’t help but be drawn to him for the gravity he exudes. This ended up with Godomar getting a little bit greedy with him and competing with Franks and Visigoths for his slice of Rome’s pie. He genuinely enjoyed Rome’s attention, but Rome didn’t feel the same way, and ended up casting Burgundians to the wolves (Huns). Years and his death later, he’s still not certain whether he actually believes that Rome would do that to him. The whole issue has him conflicted, but he’d rather not think about it.
Visigoths’ visceral reaction is anger, and after some placating by his older brother, detachment. Athaulf and Rome’s relationship was particularly tumultuous and disastrous. They used one another quite a lot. While he hasn’t entirely forgotten the tribulations he went through during life, the reassurance is reminding himself how he endured and succeeded in spite of both Romes constantly trying to undermine him. That helps him sleep peacefully. He does, however, admit that Rome has things to offer, despite how awful he is.
Ostrogoths is more tempered. He acknowledges the struggle that Rome put his brother through, and will readily comfort him, but still is able to give Rome a lot more kudos than his brother can. This is because Athal mostly interacted with East Rome. He won’t bother praising Rome in front of Visigoths, though. Ostrogoths’ brief guardianship over Rome’s sons did help broaden his understanding of Rome. He respects his legacy but beyond that, doesn’t pay much thought to him in death.
Huns doesn’t care much for sentimentality about other people. This just gives him an air of ambivalence. Although he’s deeply dissatisfied with how his imperial venture ended, he thinks of their interaction as a brief but thrilling little game. Rome surprised him in a lot of ways. What matters most is that he thinks he got even in the end, considering that Rome joined him in the afterlife very soon after he himself passed. All’s fair in love and war, after all. Everyone else’s mixed feelings on Lucius just make Mundzuk amused.