How to make a custom particle emitter that emits text. (Without Plug-ins)

You can't and that is that. Custom textures, for instance in Particle World, always change globally and thus tricks like staggering multiple texts in a pre-comp and having them sampled at different times won't work. Unless you want to hand-animate multiple layers or use expressions, which of course could still be possible if you don't need too many texts, you can't really avoid gettings some plug-in or script that can deal with this.

Mylenium