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An already existing thing in Umamusume itself is that claw machines can have a plushie you can claw out, with multiple other plushies attached to them, usually 1-2.

But there are rare chances where when you claw a plushie, you'll see there are more attached to it.

A small add on to this is that the plushies with other plushies attached to them can show the relationship between the given plushies you pulled for and the ones attached to it. It could show their dynamic, like friendship, associates, family, relatives, etc.

Another small add on, which is somewhat in the game too, is that depending on the personality of the uma, their plushie would be in a given position that shows their personality type. Sometimes the plushie could be upside down because the uma has a quirky personality. The plushie could also be turned sideways in between the others, like they're sleeping, because their personality trait is lazy.

So look out for the umas who are known for being social butterflies, or at least associated with big groups of others. When you see them in the claw machine game you would want to pull for them to have a chance of getting more plushies!

You could say that how easily the extra plushies fall off the main one could mirror the relationship between those umas. How they hold onto the main plushie could showcase a strong bond