Ive done a collection of martial arts due to constant shifting of club locations and when lifts were were not available and if I could walk it.
The 2 I have done longest are Karate (when I was young) and Taekwondo (Through most of my time at college. Thatw British college, 16-18, not US College with is actually university, and have recently taken it back up at uni)
I have also done to varying degrees from only a few lesson to a few belts:
Tai-chi
Wing chun kung foo
Akido
Jujitsu
and judo
My biggest flaw so Im told I I almost totally lack a killing instinct

I practice the art but have never used it because given the choice, of which Ive always had one, I will walk away, or delay while playing defensive to get to somewhere like a pub, so I honestly have no idea how dangerous I may or may not be. I hope I never find out.