This thread is a breath of fresh air.
A calm and collected corner is crucial in any fight. It settles the fighter down, gives him the confidence that everything is under control even after a bad round. Joe Goosen is one example I can think of. Clear, precise, collected.
I also love to listen in on the corner and analyze what they're saying then see if the fighter implements the adjustment that was suggested by the corner. It's also interesting to see if the given instructions are actually helping to the fighter.