To roleplay against the small stacks the AI uses, I make a legion 2 has, 2 pri, 1 tri, 1 lev, 1 acc, 1 ror, 2 equ, and 1 gen. I usually want to have a wide front line so I can have reserves so I bring in a couple of allied troops and place them on the flanks. A consular legion for me is 4 has, 4 pri, 2 tri, 2 equ, 1 gen, 4-5 Samnite Heavy Infantry, and 3 light infantry.