WFT is very goofy but fun to play as. She/He suffers from a very horrible grab, one that makes Ganondorf's grab look OP. Grabbing in this game is the core for great high level play and OoS options. If your grab can't touch crouching or short opponents and has horrible end lag/grab time... Then you are royally screwed. Oh hey, that describes the WFT's grab! And only his/her grab! (Ganondorf's is awful, but then there's the whole loleasySideB->combo grab)
WFT attack range is OK, but WFT sure could use some buffs to those aerial attacks. Their hitboxes are very awkward and only Uair and Bair are decent enough to land hits with consistantly. Fair is very weird. Nair has a very small hitbox that puts WFT in danger's way. Dair is as slow as Ganondorf's with less than half the KB power. You can only get KOs when the person is near 150% unless they are very close to the top or sides.
The smash hitboxes sure could use some reworking. WFT's Fsmash should really be able to hit more than what it appears to hit since you can't angle it at all. Dsmash should have a tiny bit increased hitbox since it literally ends at the WFT's foot and hand, which also happens to be the sourspot and the most likely thing to hit someone with. Usmash is OK, but is very small.
Tilts are OK as is and hit all around WFT's body. Tilts shouldn't have kill power and should be fast. WFT's tilts accomplish that at the very least. Although, slight buffing to their range wouldn't hurt the balance.
Sun Salutation is very good as is and should have healing removed IMO. UpB is decent. Deep Breathing is OK but could be better executed or at least last a few seconds longer so WFT can actually do something OR have slightly better healing since it takes skill to hit it exactly every single time in heated matches. SideB needs some serious reworking. It's great range wise and the overhead spike can be used to meteor mash, but it is too slow to use successfully for that. Hitting someone with the ball is very unsatisfying and does nothing helpful KO wise.
TL;DR WFT is rarely used because WFT has a lot of small quirks that snowball into a giant mess. The hitboxes revolve around utilizing all her/his moving body parts which result in very short but multi-sided hitboxes. That's BAD for a game that has tons of defensiveness and characters who have really stupid-good falling aerial trajectories. WFT needs more than B/SideB for range. They should just tack on some glowy sun-salutation sparkles at the end of his/her hands and feet to extend the attacks' ranges while still make SOME sort of sense. Also make WFT's grab a squat + arms out instead of a double arm raise so it can grab shorter opponents. So much can be done to fix WFT, so I assume WFT will be getting a buff in a future patch.