Question about male characters and guest characters cameos

[mugen64]

Do we have to ask permission to use male characters and also do we have to ask permission for characters to at least get a cameo or guest appearance non-sexual just story purposes like how Officer Juggs. Is to the MNF Metropolis?

[mnf_vadim]

I don't think that using someones characters on a side role could cause any problems for the original ideas owners, but it will be good to just ask here on forum if the authors don't mind.

[mugen64]

Ok thanks good to know for a future idea