Squirrel Girl - omni-versal implosion time 😄
Aunt May - 'cos Galactus just isn't eating right, he needs some mothering
The Blob - just to find out if the Power Cosmic is powerful enough to transport him at FTL speeds
IronMan - 'cos he'd have no worries about cutting loose with that power and he'd have the brains to do some really interesting things (before Galactus strips him of the PC and banishes him back to Earth)
Cyclops - really would be a bit of a Norrin MKII, but with much better fighting skills and tactics