Challenge ideas for you!

[b]One of Us:[/b] the ordinary inhabitants of the city are all polymorphed into a picture-perfect copy of one of the various characters.  For a set amount of time, all the real characters must move through the city and 'tag' people they think are the real ones by attacking them (or just touching them for less violent characters).  Tagging a correct person gets a set amount of points; tagging an incorrect person obviously gives the character away, hurts the poor civilian, and delivers a lasting penalty to the character.  Getting tagged is an instant disqualification, and all clones of the tagged character are restored to normal and teleported indoors.

[b]Swap Meet:[/b] characters' minds are swapped and they are assigned some task to do, like gathering x items or defeating x monsters, while swapped.  They carry over most nonphysical abilities and some other attributes; Filia swapped with Chun-li, for instance, would gain increased power (though not skill) and have Samson transposed to Chun-li's hair.  On the other hand, Chun-li would be left with a normal-haired Filia body and decreased power, though she retains her Kung Fu expertise.  Not all swaps would be fair; I imagine things like Twilight Sparkle / Wario and Overlord / Dizzy would be very funny.  The swaps could be made using a random generator.

[b]Diver Down:[/b] the entire City is submerged beneath an ocean.  Marine flora and fauna appear, and there are plentiful ways to get air, such as trapped bubbles in alleys, buildings, phone booths, etc.  Everyone's given some task to do.  Naturally, some great sea monster could appear.

[b]Heaven's Door:[/b] after an enormous rumbling, chunks of the city fall away into an infinite sky, and the remaining parts become sky islands.  Finding a single hidden treasure might be good in this.

[b]Shut Up and Drive:[/b] a massive go-karting event through the City or some great track.  Characters get custom karts but any cheaty powers are inhibited.  It's a race to the finish!

[b]Born to be Wild:[/b] all characters are transformed into animal versions of themselves, with most of their same powers.  Again, they're given some task to perform.  Ones that are already animals don't change.

[b]I Bet My Life:[/b] a tag-team challenge.  Characters, after teleportation to some central zone, are allowed to choose their partners starting from the weakest and ending at the strongest.  Once all teams have been created, they're let loose in some exotic location for a grand deathmatch.  A team is eliminated if both of its members are incapacitated or one of its members is incapacitated and not revived within thirty seconds.  The trick is that either character on a single team can 'bet their life' by saying so, after which they'll collapse on the spot and their teammate will receive all of their strength and powers, tailored to suit them appropriately.  A team in which a member bets his or her life has an extended time to win it all before that team is counted out.  Last team standing wins.

[b]Monster:[/b] at the start of the event, all characters are moved to random locations in a new, exotic locale, and a timer begins.  One person randomly becomes a much larger, more powerful, monstrous version of themselves, (for instance, [url=http://vignette1.wikia.nocookie.net/skullgirls/images/3/3e/DLC_Samson.png/revision/latest?cb=20130326001843]Filia[/url] and [url=http://www.conbear.com/dc/images/Highway%20Truck%20page%20%233.JPG]Dizzy[/url]) and receives points for damage and KOs it accrues while it is the Monster.  Any character who deals the finishing blow to the Monster becomes the next Monster.  The challenge is not only to hold the title of Monster longest while the timer's ticking down, but to