For Otho's had been a neglected boyhood and a riotous youth, and he had made himself agreeable to Nero by emulating his profligacy.
His Book I Chapter 13: Galba looks for a successor

Many of the soldiers favoured him, and the court was biassed in his favour, because he resembled Nero.
His Book I Chapter 13: Galba looks for a successor

The astrologers also urged him to action, predicting from their observation of the heavens revolutions, and a year of glory for Otho
His Book I Chapter 22: Revolt of Otho. Predictions

One of them, Ptolemaeus, had attended Otho in Spain, and had there foretold that his patron would survive Nero.
His Book I Chapter 22: Revolt of Otho. Predictions

Otho had long been courting the affections of the soldiery, either in the hope of succeeding to the throne, or in preparation for some desperate act. On the march, on parade, and in their quarters, he would address all the oldest soldiers by name, and in allusion to the progresses of Nero would call them his messmates. Some he would recognise, he would inquire after others, and would help them with his money and interest. He would often intersperse his conversation with complaints and insinuations against Galba and anything else that might excite the vulgar mind.
His Book I Chapter 23: Revolt of Otho. Preparations

The vices, of which alone he boasts, overthrew the empire, even when he was but the Emperor's friend. Shall he earn that empire now by his manner and his gait, or by those womanish adornments? They are deceived, on whom luxury imposes by its false show of liberality; he will know how to squander, he will not know how to give. Already he is thinking of debaucheries, of revels, of tribes of mistresses.
His Book I Chapter 30: Revolt of Otho. Piso continues
By Marcus Piso Licinianus

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

Meanwhile Otho, to the surprise of all, was not sinking down into luxury and sloth
His Book I Chapter 71: Celsus

In the midst of these measures,... and by a decree of the Senate restored the statues of Poppaea.
His Book I Chapter 78: Revolt of Vitellius. Bribery of Otho

Otho, with his profligacy, his cruelty, and his recklessness, was held to be more dangerous to the common-wealth
His Book II Chapter 31: Otho versus Vitellius. The strategy of Otho

In Otho's army the generals were full of fear, and the soldiers hated their officers;
His Book II Chapter 41: Otho versus Vitellius. Preliminary skirmishes

I hold that to expose such a spirit, such a courage as yours, to any further risk is to put too high a value on my life. The more hope you hold out to me, should I choose to live, the more glorious will be my death. Fortune and I now know each other; you need not reckon for how long, for it is peculiarly difficult to be moderate with that prosperity which you think you will not long enjoy. The civil war began with Vitellius; he was the first cause of our contending in arms for the throne; the example of not contending more than once shall belong to me. By this let posterity judge of Otho.
His Book II Chapter 47: Otho versus Vitellius. Otho decides for suicide

At dawn he fell with his breast upon the steel.
His Book II Chapter 49: Otho versus Vitellius. Death of Otho