Konohamouru summoning enma the monkey king...... yea no, he is gonna die in chpt 422 trying to save tonton and tenten.
I don't really see why anyone wouldn't be able to sign more than one contract. But the only person who's summoned two different things is Orochimaru: His Snakes and that Rashoumon Super Wall. This is under otherwise normal circumstances so I'm not counting Pein and his freak summonings.
plus Pain but thats a little different.... cuz he hacks
Yea, I'm not counting Pein and his summons. There's obviously something different when it comes to him.
he prolly rapes his summons into agree to contract...lol