[quote=@Rilla]
<Snipped quote by ImportantNobody>

Each others characters

[/quote]

Not that the other also can't be a thing.

For the dice rolling mechanic we could use [url=http://www.wizards.com/dnd/dice/dice.htm]this[/url] and use the bottom option for a 100 sided dice. Each of our attacks will have a base percentage of doing damage, from 0% to 100%, and based on the circumstances you can up or lower the percentage for the attack. Each character would have a dodge number to start with (a nimble person having 30, for example, meaning they subtract 30% from the enemy's attack) and then how they dodge could also change things. Not being able to move would eliminate all dodge.