HotRod said:
You mean EV 9D9....easy!!!

[shocked, punches HotRod in face and tells him to go outside]

So once again just to be clear-what do proton torpedoes and assist trophies do?

Proton torpedoes destroy a question and make it unanswerable for a round. Assist trophies are a mystery, check the link I provided, which explains what they do in Super Smash Bros. Assist trophies will basically be a familiar famous Star Wars character coming in to destroy the other players for you.