No way is Morpheus an ISTj. I think his beliefs are so strong because he isn't the type to be dogmatic under normal circumstances.

He's also pretty sanguine, and his social skills aren't really lacking, and he's always pretty calm and collective. I'd guess INFj for Morpheus. I mean, come on. Watch the scene in the second movie when he makes that speech in the cave. Could an ISTj ever make a speech like that?