Is this LEGO set still sought after by Super Mario fans?

Yes, as a sealed 2021 release, it remains a desirable collectible within the Super Mario theme.

Does this pack contain any actual building pieces?

No, according to the set details, this pack contains 0 pieces.

It is listed in sealed box condition.

Name: LEGO Character Pack Series 3 - Sealed Box (6332731-1)
Brand: LEGO

Super Mario

Super Mario · 2021

Theme · Super MarioPieces · 0Set Number · 6332731-1Year · 2021

Used

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New / Sealed

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Is this LEGO set still sought after by Super Mario fans?: Yes, as a sealed 2021 release, it remains a desirable collectible within the Super Mario theme.
Does this pack contain any actual building pieces?: No, according to the set details, this pack contains 0 pieces.
What is the condition of the LEGO Character Pack Series 3?: It is listed in sealed box condition.