How do 你 unlock all the characters?

One way is to go through the adventure mode.
But a few like Toon Link are found through hidden doors.
After 你 get so far in this mode tyou go to 前一个 levels to locate them.
I can't remember the details

The long way is to just play the game until 你 are challenged.
After so many total hours of game time a secret character challenges 你 .
Time spent on the menu screens does not count only the time spent fighting .

to unlock sonic 你 have to beat classic mode 10 times and the 10th time 你 beat classic mode 你 have to beat sonic to get him

normaly i just get them all in subspace so keep trying.

just play adventure mode

你 unlock them:) xD

你 can get them from SSE, but their is like two characters 你 can't get from it (Jigglypuff and Wolf).

I usually just play with a friend and they come and challenge u and u have to beat them to get them as a playable player although most characters are in the embassy

你 can get every character from the Subspace Emissary. Toon Link, 狼 and Jigglepuff are found in The Ruins, The Wilds, and The Forest. 或者 something like that.

yup i have!