For me. I really love to play Nefara. She is such a high skill cap that its easy to say she is currently the highest skill cap in the game of all the commanders. The difference between an okay nefara and a good nefara is massive margin and game determining, while the difference between an okay BRO and an Good BRO is more about which proficiency they took. She is the funnest to play.
My favorite to listen to is BRO. Every one of his lines is gold medal script writing.
My favorite sniper is Itarri. There is something about a girl who brags about riding bareback that just makes me giggle perversely every time. Also, dat skin tight suit yo!
My favorite 'thing' would be Bloat. Giving Bloat Jobs is hilarious. He's such an underdog commander who is secretly strong.