create a mod which adds another combat area such as the arena but this would add a new option

be able to use the characters from the mods but online

It would be a good idea but at the same time most of the developers would have to join together to give their permissions for their characters so that they can be used in this new arena

It could be difficult to create a ranking and equipment and accessory

and most of the mods would have to be updated, at least the texts and texture among other things