Discover all this, if the player are egoist, playfulness and others is the abilities of Coach, of User, of us!
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Totally agree.
I think this already exists, just hidden.
The simplest to discover is "arm crusher" (a lot of fouls). hahaha!
I also feel there are already player "tendencies" that aren't outright said to you, but are there.
That's why I watch all my teams games in the viewer when I'm able to get around to it. To notice those patterns.