Available Mods
One of the most popular requests in the modding community is to rebalance or add additional characters and classes to the "Diablo II" character file. The best way to add additional content, such as characters, is to visit the ModDB.com and search for "Diablo II" mods. Many members of the community have banded together to create entirely new scenarios and levels as well as new character models and classes. Because these mods use a common tool set, you just need to download them and then run the attached installer file. This will automatically install your new content and make it available immediately.
The largest character update that includes seven new classes, 30 new skill trees as well as new models is the Median-XL mod. The use of this mod will add hundreds of hours of additional playtime and re-playability to your "Diablo II" game; best of all, it's free.
Creating Characters
Standing on the backs of giants is a great way to get started, but what could be better then creating your own characters and classes in "Diablo II." There are some very simple tools that will allow you to create your own cheat or modification to the game. Using the mod tools, you can edit existing character classes to suit your needs or create entirely new ones. A character is composed of a spreadsheet of skills and abilities that is linked to a group of animations and artwork. Use the mod tools to create a new row or edit an existing one to change the abilities to make your hero exactly how you want him. Then download additional animations and artwork to give your character a unique look. Some of the best mods actually import characters from "Diablo I" or Diablo III" into the storyline of "Diablo II." It may take a few tries to get the hang of the editing tools, but the results are well worth it. Additionally, you may share your results online for other players to expand their games as well.