There's probably multiple complicated ways to edit the Introductory parts of a FireRed game, but unLZ doesn't seem to be able to edit that Professor Oak sprite anymore than NSE or the various other sprite programs I've checked out. Perhaps I've missed something with how the 256 color sprites are indexed, but I think it might be simpler to just remove the intro altogether.
However, I haven't found a well-annotated dump of the ROM data, so I'm not sure where to go in a HEX editor to just skip the intro and let the game start at my appointed 'starter' location. Seriously, I don't care about the GameFreak Intro, the Eyecatch Demo, The Title Screen, The Pikachu how-to-play intro, Prof Oak's Speech, Naming the Player/Rival, or starting in Pallet Town. Is there any way I can just replace all of these with blank space and just have the game go directly from "On" to "Start New/Load" and then from "New" to "your PC can move around!" without all of Oak's yammering? I'd do it myself if I could find where all the pointers start.