All of them.
3140 ' = 1046.666 yd
You could get 24 characters in all
3140
2 raptros and zorgulon
It has 16 forward and 8 reverse.
24, you start off with 12 and unlock 12.
Approx 2450 times.
You can get up to 17 characters in Mario 7 including Mii character. 9 of these are ones that you need to unlock.
to unlock everything you can either unlock characters/items by playing expiedition mode or doing challenge mode which you can unlock by defeating Bowser Jr through many journeys in super sluggers
you need to win at least one game with all characters to unlock captain falcon
There are many secret characters in Brawl to get them you can do various things for each character, but the easiest way to get them all is by beating the subspace emissary mode 100%.
You can unlock the characters in many ways the easiest way is to complete the subspace emissary mode 100%. Also if you play up to 400 brawls you can battle certain characters if you win you unlock them, also if you complete certain modes like boss battles you can fight other secret characters, if you beat classic mode on certain modes you can fight a certain character at the end, if you beat classic mode with certain characters you can fight another character at the end. The possiblities are out there go hunt down those characters!