Revenge on the legion, with boone and him, and That eyebot, forgot his name, would be fun.

Would have been nice to have him as a perm companion vanilla.

Scorpion and Sub-Zero?
Courier and the Burned Man?
Courier, Ulysses AND the Burned man?

[censored] yes please.

You could go to the mod forum section and REQ one.
I'd make a wild guess that they'd have to create a whole new companion that uses Joshua's (or Daniel, or whoever) sound/appearance files etc. to it, then drop/script them into some location, in order to get them into the Mojave. Whether someone will do that, who knows. It hasn't been very long, be patient.

I am being patient, so don't try to get a altitude with me.

Ease up mate, she was just telling you to wait for a bit.

An altitude? do you mean attitude? And yah im sure someone will have a mod for him by the end of the week if not already.

I see only one problem with this and it's how is he going to have a voice outside of his soundfiles in the Mojave Wasteland. I guess they could figure out a way through modding but I'm not sure.

If the modder in question has audio editing equipment it's actually not that hard to take cuts from the current sound files and splice them back together to make additional speech. Time consuming? Hell yes, but not particularly difficult. Generating the .lip files for the facial movements might be a pain, but I don't do much of that so I could be wrong.

Making the appropriate dialogue trees with all their conditions would take a while, as would making any companion quest. The various animations are probably already there so those would just have to be C&P over to the new character.

I'm not about to try this myself as I svck at making NPCs, but this should at least give you an idea of what someone who's good with them has to do to make one.