GUYS.
So I tested some stuff with up throw. Actually I found out some interesting things with her throws in general. Okay, first off, up throw does 11 damage. It's not her weakest damage throw. Also, if both up throw and up air are fresh, you can do a total of 26 damage to your opponent from up throw + up air at early percent.
Stage uses: Up throw is useful on Pictochat when the spiked flower shows up above you. On platforms, it seems easier to punish their landings. On Rainbow Cruise, you can try up throw on the swinging pendulum so that they'll be sent to the yellow blocks. If they tech it, you can try to follow up with an upsmash or aerial of choice. If they land on the pendulum again, you can down smash or follow up with another move (preferably a ground move) of your choice. If their damage is kinda high, down smash may kill them, since you'd be rather close to the death zones.
Teams: If your partner is comfy with the exact position your opponent will be in after you up throw them, they can try to follow up with an aerial of their own. Oh and if you accidentally grab your partner and he's at really high percents, you can up throw him to avoid killing him (unless he's like at 180 + or something, or is a Jigglypuff xD) Down throw would work too but it's slow, and your opponent can try to punish your partner after it.
I found out something BROKEN with Zelda's f-throw but I'll leave that for when we discuss it.