Taking away the option to name a character is a simple event hack. You just have to find the part of the code where the name change screen appears in the event script and FD it out.
The other change is pretty simple for the most part if you are okay with giving him Banon's sprite or something (povided no nasty issues arise on shop screens or something). Then you just have to assign Banon's sprite to him through event coding. If you want him to have a generic old guy's sprite, you'll have to either replace another character or use Edrin's method to expand the number of sprite sheets so that he can use one in battle.
The other change is pretty simple for the most part if you are okay with giving him Banon's sprite or something (povided no nasty issues arise on shop screens or something). Then you just have to assign Banon's sprite to him through event coding. If you want him to have a generic old guy's sprite, you'll have to either replace another character or use Edrin's method to expand the number of sprite sheets so that he can use one in battle.
Moogles FTW