https://www.reddit.com/r/smashbros/comments/acpifr/analyzing_leaked_dlc_character_parameters/Keeping in mind that these are all subject to change until they're actually released:
Piranha Plant is one of the heaviest characters in the game, with average run speed and really slow movement in the air. It's also got serious landing lag on all of it's aerials, so it's probably gonna play like Little Mac in the sense that you want to be on the ground as much as possible.
Joker is one of the top ten fastest characters, but he's a lightweight. Similar in stats to Fox or Sheik. He's got a rapid jab and a wall jump.
"Brave" is a minor heavyweight, but with ground and air speed in the middle range, closer to Mario. Which, if it is Erdrick, makes sense considering he'd be wearing full armor plus a sword and shield.