Kyokushin is actually a very good karate to develop fighing ability and a fighting spirit. There are only a couple of draw backs from this system that I have observed:

1) No punching to the face

2) No grappling/limited clinch

3) They tend to go toe to toe instead of using angles of attack

but other than that I would go for it.
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"I'm gonna come at you like a spider monkey"