Spray an 8x8 pan with nonstick spray. Spoon one cup of lemon pie filling in the bottom of the pan.
Mix the agave necter and liquor. Dip 12 lady fingers in the liquid mixture and press into the lemon filling.
In a medium bowl beat together cream, mascarpone, lemon zest, and marshmallow creme until soft peaks form. Beat in remaining lemon pie filling. Set aside.
Top the ladyfingers with half of the cream mixture. Repeat with another layer of dipped lady fingers, and top with remaining creme mixture.
Chill dessert for 2 hours. garnish with lemon zest or lemon slices.