Ender, from what I see, you want to model, texture and animate the character you want in Blender then put into your own game or a game as part of a mod of whatever (if I am wrong with what I have said, sorry as the following uses the above assumption)
From personal experience in trying to make a character for Half-Life in 3dsMAX, you need an exporter that will convert the model (i.e. mesh, material and animation information) into the native format of the game that it is designed for. If the character is for your own game and you haven’t made it in Blender, then you will have to write an exporter which will convert the .blend into your format that you program into your game (e.g. .mdl for HL). This requires the taking up of python scripting.
If you have programming experience, I have heard python will not be hard to learn. Learn how to access the mesh information etc. of the .blend and how to convert it to what you want. I think it will be extremely hard unless you have alot of 3D knowledge…
If the character is for a wide-spread game, have a search around for an exporter that will convert the .blend to what you want, but I don’t like your chances.
Hope I could help (I know it is a bit all over the place)