The men Napoleon seems to have thought of as potential rivals were mainly Louis- Charles Desaix, whose wiki article says almost nothing about his personality but seems to have been a rather more sociable, outgoing, optimistic type than Napoleon- less of a misanthrope, anyway. Killed at Marengo, fortunately for Napoleon:
and his brother in law, Charles Emmanuel Leclerc, who was another mostly upbeat type, who he distrusted so much he had him sent to the unpopular job of fighting the Haitians and die of yellow fever.
Net famously suffered from tunnel vision on the battlefield; not having a good grasp of the situation around the fight, nor of what battles he ought to pick- he was an operational commander, not a strategist.
The best of the Marshalate were early on, Massena, who would be a disaster as a civil leader having more than a touch of the kleptomaniac about him, and a nepotist to boot; later eclipsed by Davout, who was almost the opposite, rigidly, scrupulously honest, but ruthless, hard- handed, demanding, and famously dour, miserable and grumpy. Even Napoleon was better than the choice between a thief and a witchfinder- general.