That two men, who for shamelessness, indolence, and profligacy, were the most worthless of mortals, had been selected, it would seem, by some fatality to ruin the empire, became the open complaint, not only of the Senate and the Knights, who had some stake and interest in the country, but even of the common people.
His Book I Chapter 50: Revolt of Vitellius

Prayers for either would be impious, vows for either a blasphemy, when from their conflict you can only learn that the conqueror must be the worse of the two
His Book I Chapter 50: Revolt of Vitellius

Though sterner judges pronounced Vitellius to be a man of low tastes, those who were partial to him attributed to geniality and good nature the immoderate and indiscriminate prodigality, with which he gave away what was his own, and squandered what did not belong to him. Besides this, men themselves eager for power were ready to represent his very vices as virtues. As there were in both armies many of obedient and quiet habits, so there were many who were as unprincipled as they were energetic;
His Book I Chapter 52: Revolt of Vitellius. Preparations

Vitellius, on the contrary, was sunk in sloth, and anticipated the enjoyment of supreme power in indolent luxury and prodigal festivities. By midday he was half-intoxicated, and heavy with food;
His Book I Chapter 62: Revolt of Vitellius. His character

Vitellius with his sensuality and gluttony
His Book II Chapter 31: Otho versus Vitellius. The strategy of Otho

He then ordered the whole army to come and greet his infant son; he brought him out, wrapped in a military cloak, and holding him in his arms, gave him the title of Germanicus and surrounded him with all the insignia of the imperial rank. It was an extravagant distinction for a day of prosperity, but it served as a consolation in adversity.
His Book II Chapter 59: Otho versus Vitellius. Vitellius travels through Gaul

He had a scandalous and insatiable passion for feasts; the provocatives of gluttony were conveyed to him from the capital and from Italy, till the roads from both seas resounded with traffic; the leading men of the various states were ruined by having to furnish his entertainments, and the states themselves reduced to beggary; the soldiers fast degenerated from their old activity and valour, through habitual indulgence and contempt of their leader.
His Book II Chapter 62: Vitellius emperor (cont.)

The astrologers were banished from Italy.
His Book II Chapter 62: Vitellius emperor (cont.)

He was the slave and chattel of profligacy and gluttony.
His Book II Chapter 71: Vitellius emperor. To Rome

But now, both the Emperor and the army, as if they had no rival to fear, indulging in cruelty, lust, and rapine, plunged into all the licence of foreign manners.
His Book II Chapter 73: Vitellius emperor. Rumours

Thus utterly regardless of all law human and divine, with freedmen and friends as reckless as himself, he lived as if he were among a set of drunkards. Still at the consular elections he was present in company with the candidates like an ordinary citizen, and by shewing himself as a spectator in the theatre, as a partisan in the circus, he courted every breath of applause from the lowest rabble. Agreeable and popular as this conduct would have been, had it been prompted by noble qualities, it was looked upon as undignified and contemptible from the remembrance of his past life
His Book II Chapter 91: Revolt of Vespasian. Vitellius rules

No one sought promotion in that court by integrity or diligence; the sole road to power was to glut the insatiable appetites of Vitellius by prodigal entertainments, extravagance, and riot. The Emperor himself, thinking it enough to enjoy the present, and without a thought for the future, is believed to have squandered nine hundred million sesterces in a very few months.
His Book II Chapter 95: Revolt of Vespasian. Vitellius' birthday

Buried in the shades of his gardens, like those sluggish animals which, if you supply them with food, lie motionless and torpid, he had dismissed with the same forgetfulness the past, the present, and the future.
His Book III Chapter 36: Vitellius versus Antonius Primus. Reaction of Vitellius

Or the emperor's ears were so formed, that all profitable counsels were offensive to him, and that he would hear nothing but what would please and ruin.
His Book III Chapter 56: Vitellius versus Antonius Primus. On Vitellius

Such a lethargy had come over his spirit, that, had not others remembered he had been an Emperor, he would have himself forgotten it.
His Book III Chapter 63: Vitellius versus Antonius Primus. An army of Vitellius surrenders

Then showing greater and greater disregard for the laws of gods and men, he assumed the office of high priest on the day of Allia
Stn Vitellius, Chapter 11: Vitellius in Rome

But his besetting sins were luxury and cruelty.
Stn Vitellius, Chapter 13: Luxury

He delighted in inflicting death and torture on anyone whatsoever and for any cause whatever
Stn Vitellius, Chapter 14: Cruelty

When his mother died, he was suspected of having forbidden her being given food when she was ill,
Stn Vitellius, Chapter 14: Cruelty