This is my current line up for arena. Unfortunately when I had originally started I was working on heroes that aren’t really as effective in arena anymore so my woody and Judy are further behind in rank and stars than I would like (and some of my other heroes of significantly higher power).
Ultimately I want to substitute calhoun out for mike but my mike currently is too underpowered to be viable in my lineup. For the moment though Calhoun’s violet disk is a great start to a wave and she has very high damage, she does not synergize very well though; not like Mike synergize with both zurg and sulley. As for Judy she is invaluable for her speed buffs that she gives at the start of a fight, she makes it so that you get a head start on your opponent, or if they are also using Judy that you keep up to speed.
Woody provides a bit of team sustain and a charm, but the biggest benefit is how he synergizes with zurg. If woody and zurg ult at the same time zurgs ult cuts through the enemy team like butter.
All in all I would recommend that when you are looking for strong comps in arena take a look at your ranking building and select ‘arena’ rather than ‘power’. Take a look at the top arena players on your server to get an idea of what heroes are on everyone’s roster, it will give you a good idea of how to build.