Flash, Firestorm, and Supergirl spend the entire time making fun of how useless everyone else is.
__________________ Chicken Boo, what's the matter with you? You don't act like the other chickens do. You wear a disguise to look like human guys, but you're not a man you're a Chicken Boo.
Legends is awesome. The other two became very 'meh' though.
Don't expect a crossover like this to be anything great either, however. Depending on the plot, it's hard to see everyone being about as fleshed out or of around equal use.