While I felt the level of humour in MoS was rather subtle, and with the name badge reveal that Jenny is pretty much NOT an Olsen (ala Jurwich),
I daresay introduce Jimmy in the sequel. And I wouldn't object to Cat Grant and Mercy Graves being in there too. But with Jimmy he'll be more an enough to lend a lighter tone to the next film(s). Heck if Toyman was ever introduced in these films no doubt would he even lend some humour as well.
Hopefully we'll only see Lex and Mercy and nobody else except for your nameless security guards as you do. But all dialogue should be between Lex and Mercy. Please Snyder/Goyer/Nolan - make it so!!