Performance is all. No plug-in is going to change the performance, only the tone, perspective and, in some cases, the formant.
For example, lots of people ask how to get that "classic" voice over tone - usually meaning the voice of Don LaFontaine. Sorry, it can't be done; you need to have that voice to begin with. Yes, there are techniques that will get you closer - mic selection, mic technique, line delivery, and the like - but nothing will make you sound like Don LaFontaine.
Now, if you are asking for the PA sound, again, you should start from scratch. Most stage mics used for that purpose are dynamics - the Shure SM-58 is a standard - and sound different than condenser mics. Then you need to deliver the lines as a stage announcer would with that mic, probably almost shouting. And you should "eat" the mic; deliver the lines with your lips almost touching the wind-screen. Then you put the resulting recording through an IR reverb like AltiVerb and/or a processor like SpeakerPhone, which have various speaker emulations and "real world" ambient environments. If you don't have access to those types of plug-ins, you can "worldize" by putting the dialog through a real speaker (a guitar amp would be fine), or you need to use an EQ and perhaps a distortion plug-in (and maybe even some compression) to create the PA sound. Then you need to use a reverb to recreate the space in which the PA is situated.