I have 1.3 r129 installed and have learned how to make custom buttons with commands on Fake Console list from the help of Zerted.

I'm using the asset scripts to munge a new mission.lvl similar to the retail file.
On each stock mission I have the ability to toss in FC commands, then when I munge, I just copy the new mission.lvl into gamedata\data\_lvl_pc and replace.

Then when I begin the game my commands are there and have already made plenty of stuff work.

Then I'd say not more than 30 minutes later, I had this idea:

On the script for tat2g_eli (Mos Eisley Assault) I decided to try to call in a character while running the game.

The first button I titled "Call Lord Vader" which would run this command:
ReadDataFile("SIDE\\rep.lvl", "rep_hero_cloakedanakin")

While in-game I would click "Call Lord Vader"

Then I would click the 2nd button titled "Assign Lord Vader" with this command
AddUnitClass(IMP, "rep_hero_cloakedanakin")

How ever the game just crashed when I click the command Call Lord Vader, not giving me a chance to "Assign Lord Vader" to a team.

My question is, if possible, how may I call in new characters with FC commands and assign them to a team.

Lua setup: And here is bf2log: (long log, here is important bit)

There's probably some memory pool you also need to add. Look at a different map that uses cloaked anakin and compare the memory pools. My guess is it's something to do with cloth, but I don't know memory pools that well.

I've added hooded Anakin to tat2g_eli before without changing anything else, simply by calling the string and adding it to a team.

Having as fake console option would be better, it saves MP functionality for that mode.
Having an extra character on your side, then join MP, you spawn as something else, host doesn't have the edits.

I hope the game engine allows stuff like this, but I don't know how else to call characters to a running level.

It's totally possible. In fact, one of my projects makes use of this feature.

Super cool! Is it easy?

I'd love to add buttons for each level to call in unique characters for what ever level it would be.

Just follow this tutorial:
viewtopic.php?f=27&t=29399&p=495872
Except add it to setup_teams.lua or make your own .lvl file for it. (see the tutorials "Munge a custom .lvl file" and "Make a custom user script" in the 1.3 patch docs.)

Yes, I'd recommend adding custom commands through a user script. That way you don't have to mess with mission.lvl. Here's an example user script that does uses different spawn paths based on which map is being played: viewtopic.php?f=27&t=28821&p=489493&hil ... ls#p489493

v1.3 added the global variables: __thisMapsCode__ and __thisMapsMode__ which will help tell you what map is playing. They're set by the ReadDataFile() call that loads the map. If you're loading sections from different maps, it should end up with the code of the last loaded map.

Why don't you post your memory pool lines. I can't debug that, but someone else probably can. Your unit loading issue should be fixable. Three things to check:
1) Make sure you're not over the unit limit for IMP. The game only supports so many unit classes per team. See the limitations thread in the FAQ.
2) Switch IMP to it's actual number to double check that IMP isn't nil.
3) Try using ReadDataFileInGame() instead of ReadDataFile()