Haven't gotten to all the boxers yet (Currently lost twice to Sodapop ...) but I have to say my favorite is the new character, the irish dude Aran something or something Aran. Love what they did with him, and nothing beats a crazy irishman screaming "You're not Irish!"

Yah, Aran is definately the most hilarious so far, I got a good laugh the first time I seen his intro, then when he goes behind you and makes the face while on the vs screen.

I've gotten as far as Bear Hugger so far (taking my time with practice mode, so that i have the patterns down pat, and only have to worry about damage and tiring), and my favorite has been Piston Hondo so far.

It is tough to choose, but Piston Hondo in Title Diffence Mode is a lot of fun.  As well as Super Macho Man, he not only flexes his chest now.  He also flexes his rear end LOL!  It's pretty funny  My least favorite is Disco Kid in Title Defense Mode, it is very homosexual to say the least!  Best game ever, I'm at the great tiger in title dense mode as of now.  It's gettin really hard now.

I hate them all because they punch me in the face, I only like them when I knock them the fk' out.

All of them...
Also Aran Ryan is being a birch to figure out...

Donkey Kong.

If you mean dodging his punches, that'll will take practice. If you mean how to land more than one punch on him at a time ... I only figured it out when Doc gave me good advice (There's a first for everything!) after round 1. So if that's the case, listen to Doc closely and you can figure out what you need to do.

Mr Sandman.

Aran Ryan is great.

I'll pick King Hippo, for actually sounding like a goddamn hippo. Seriously, he's not human. He's just a hippo in a man costume fighting for his next meal.