You can edit a number of things client side Zeni, souls etc but unless there is a way to get the server to accept the changes, as soon as you spend some currency or leave the game it reverts back. Also trying to spending over the original currency throws you to the title screen with an error.
You can edit level of characters up to 9999 the value will show higher if you type in a higher number but in terms of stat increase the game stops at 9999. Makes any battle easy and also helps with some of the missions like the high rising rush damage challenges. If your character is not max level (300/600/1000/) you cannot freeze the value it will cause a crash as finishing a mission results in a level up, server doesnt like that. So you have to change it after every game.
You can also edit health and freeze it for both you and your opponent this helps to get more missions done obviously.
Hopefully this gathers more interest i love DB legends.
P.S - STAY OUT OF PVP! You will be found, and banned for doing this in PVP, dont ruin other people fun.