As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World 6(manga)

It's brains over brawn in this new isekai adventure! One day when leaving work, a salaryman dies and is reborn in another world as the weak child of the noble Louvent family. Using his "appraisal" skill, which lets him see the stats of others, young Ars Louvent recruits the best people to his side in order to turn his country around.

THE TEST
The war of succession is in full swing, Ars having recently uncovered Prince Vasmarque’s ruse. Ars then sets about finding new vassals for Prince Couran’s camp, soon stumbling upon a foul-mouthed, heavy-drinking woman named Mireille. Though Mireille’s skills rival even Rietz’s, Ars decides to test his new find by staging a mock battle. With Mireille leading one side and Rietz the other, the clash is sure to be nothing short of explosive.