Unless your NPC is gonna throw hands or be will frequently be active with the party, you can skip the AC, hit points, and attack bonuses. What you need is juuuust enough detail.
Not all bards are built the same... From the "jack-of-all trades" Lore bards to Dance bards who throw hands (and hips), here's my full rundown of bard colleges, so you can find the one that matches your energy.
Turn the Apothecary Diaries' Maomao into a D&D 5e character with my Rogue (Thief) build guide: ability scores, skills, background, and roleplay tips included.