What if the Roman Empire never fell in the 5th century.

Ataulf and Galla Placidia's son Theodosius would be the perfect fit for this.

His barbarian ascendency would, in my opinion, provides at the contrary a huge obstacle. Both for Romans, that aren't going to accept this, and for Goths (Athaulf being murdered possibly for being far too pro-Roman).
 
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