How to Create a Character in Fallout 3 G.E.C.K.

Open the G.E.C.K. Select "File" and click on "New." A window will pop up. Double-click any dependencies you wish to use, such as "fallout 3.esm" (this is the main game; always select this dependency). If you are editing a pre-existing plugin, then set that as the active plugin. Select "Okay" and wait for them to load.

Browse to "Actors" and click on "NPC" in the object window that opens.

Right-click in the main listing of NPC in the right-panel and select "New."

Add a unique ID such as, "0_," with no spaces to ensure it starts at the top of the list later.

Add the character name and fill out remaining information and Traits in that window tab.

Select the "Stats" tab in the upper-right and fill out the stats of your character.

Select the Faction tab, also on the upper-right. You can choose to which faction your character will belong. For example adding the "Ant" faction will cause him to be friends with all the ants in that faction. You can change character rank here too.

Select the "AI" tab and set the personality settings, such as how aggressive the character is, or if he cares if you break the law.

Select the "Inventory" tab. Add what the NPC is carrying. The NPC will wear whatever clothing and weapons you add with the highest value or armor rating. You can change the item and its quantity in the drop-down menu in the tab window.

Click on the "Face" and "Face Data" tabs to edit your character's look and preview them. The remaining tabs are full of optional advanced settings to control your character's behavior. It's advisable to avoid these initially. Select "Okay" and exit the window.

Add your character to the main game in the "Cell" window. Select a region and double-click on it to display it in the "Render" window.

Drag the character's ID, "0_," from the "Object" window to the "Render" window and push the "F" key to drop the character to the ground.

Save this plugin to the "Data Folder" and exit.

Open the "Fallout" launcher. Select your plugin and launch the game. Go to where you added the character in-game and meet him.