Someone like the fictional character Uriah Heep.
To be a yes man, in the style of Uriah Heep.
A fictional character, Uriah Heep, in the 1850 Charles Dickens novel David Copperfield, noted for his cloying humility, obsequiousness, and insincerity, the stereotypical yes man.
One who brownnoses (flatters or humors somebody in an obsequious manner for personal gain); one who sucks up; a bootlicker, ass-kisser, sycophant.