Somebody posted this on /v/ and I thought it was a good guide:
Meta-analysis and barebones guide.
Since all cards are predetermined and there are no character hypers, characters are literally just their stats and passives. Which makes a few characters far better than others.
+2 attacker or Castle
Several characters(mainly +2 attack) are given 8 recovery. As in they have to roll a 6 for three turns before the revive roll gets easier. Since it's a loss when everybody is dead at once, this is a major downside. The extra attack is a significant contribution considering it means +1 damage per battle, but it's a tradeoff. If your defenders are good you might never die.
As a defender you attack second against John. For that reason Sherry's stats are without negative. Tequila has the potential to bite back as well. However Sugu2 and Shifu are the best users of protect due to regeneration. They all have +1 attack so they can also heckle John if they find the opportunity and have the HP.
There's not much to support besides being alive when everybody else is dead. Most reliant on reaching Norma 5 as their hyper is the most important once things get going. There are nearly unsurvivable setups John can inflict such as Sealed Guardian or Delta Field which will guarantee everyone's deaths. A support can prevent total loss by reviving a person who died and is before them turnwise. Walkover revival costs are recovery times 5. Somebody like MSora gets revived for free while a Castle that just died is 45 stars.
Also choose a good map. Some are ass while some are great. Treasure Island Night has woPost too long. Click here to view the full text.