Roman Emperors (Ethelred the Pious)

Before Charles the Fat's coronation in 881, the Imperial throne had been vacant a few years. The history of France and Germany was essentially the same as OTL until his reign.

Charles the Fat: 881-888: died as Emperor, was not deposed

Louis the Wary:888-915: disastrous Italian campaign that resulted in his blindness is butterflied away, but he is killed in battle against the Magyars

Charles the Simple: 915-932 - died in prison following the revolt of Robert of Paris, as in OTL, but it happens a bit later.