Goron Link is probably the most useful one, but all of the MM transformations are amazing.
The fairy is also probably the best part of Zelda 2, though i feel like it never truly reaches its potential.
The transformations in the Oracle games are completely pointless, but at least they’re funny.
The bunny just kinda exists. It’s really only shown for a brief moment before being relegated to a temporary status condition. Its almost like they said “shoot, we made an entire sprite animation for this to only use it once. Quick, make a trap to randomly throw in dungeons!”
And then Wolf Link single handedly brings TP from a 4/10 Zelda to a 3/10 Zelda.