In multiplayer do both parties need the map expansions?

[goaction]

I want to use the map dlc but does my partner need to have all the same dlc to make the map expansions work?

[Nibbins]

Nope, it's enough if one of the players has it

[goaction]

does the host have to have it or any player?

[Thugnificent (Evilflan)]

If any player in the lobby has an expansion, it's usable in that game for all players.

[ReivaX]

What if i have an expansion, my friend has an other one. Can we still use both?

[Thugnificent (Evilflan)]

Originally posted by Its a ♥♥♥♥♥♥♥ Bulldozer:

What if i have an expansion, my friend has an other one. Can we still use both?

Yes.

[Assknight]

You can also use other people's characters if the game is set for random characters.