The larger-than-normal default Zero Suit Samus represents Shiva, a large, curvaceous female character with a blue color scheme.
The stage and Freezie item reference Shiva's ability to control ice and use ice-based attacks in the Final Fantasy series.
The music track represents JENOVA, a female humanoid character similar to Shiva who both appear in Final Fantasy VII.
The Krystal Assist Trophy further references Shiva's design, blue color scheme, and ability to use ice-based attacks, as well Shiva's role as a summon in the Final Fantasy series.
Other trivia:
This spirit's Support type further references Shiva's role as a summon in Final Fantasy VII.
This spirit's Shield type and Ice-Floor Immunity ability further reference Shiva's blue color scheme and ability to control ice.
