Anything that is default is allowed, so the default 322 songs are allowed to be shown. Also anything that has been confirmed before release of the game is also allowed so the Palutena's Guidance conversations are also allowed.
This got me thinking, if anything that is default by this time is allowed, than there should be no problem with revealing all the characters that are also on the 3DS, however, what if there are still more characters to be shown and they can do it just yet? It is highly unlikely.
Also, I've see the Palutena's Guidance conversations and they are awesome, so I thought of one to Isaac's:
Viridi: Who's that handsome guy?
Palutena: No wonder the Goddess of Nature is interested in Isaac.
Pit: Isaac? Isn't that the leader of the Warriors of Vale?
Palutena: That's right Pit, Isaac, alongside Felix, was the leader of the group of eight warriors that saved Weyard.
Pit: That mere swordsman saved the world?
Palutena: You shouldn't understimate Isaac, after all, he is both a master at sword and Psyenergy.
Pit: Psyenergy?
Palutena: That's right, Psyenergy is the force of the elements. Earth, Fire, Wind and Water. In Isaac's case he is a Venus Adept.
Pit: Venus Adept?
Viridi: Could you be more ignorant Pit? Venus Adepts' Psyenergy is based on the Earth Element, which means Isaac can control both plants and boulders, such an awesome power...
Palutena: Not only that, he can also form a powerful sword out of his Psyenergy called Ragnarok, or cast a Psyenergy hand known as Move, that can push you and block projectiles.
Pit: So, any tips on beating this guy?
Viridi: Treat Isaac with respect, anyway, he might be to much for such a puny angel to defeat.
Palutena: Don't listen to Viridi Pit, however, defeating Isaac won't be easy, he excels at both sword and psyenergy, so try to look for an opening after an attack and strike him back.
Viridi: Good luck at finding that opening little Pit.
I hope you liked my idea of a guidance conversation and I would also like to see yours