My younger brother is currently a purple belt in karate. He really enjoys it, and I was considering starting.. but i'm really unsure..

when i was younger i did karate.........my little brother is a boxer, and i took it up a few years ago when he did, most of you say boxings a sport tho which it is. ill probably get into sum judo later in life.

Yes, boxing is a sport, but that's not to say it isn't a martial art by definition. Boxers are definitely human weapons too.

If you like it and you believe you can work with it, it doesn't matter what people say, practice and perfect it as you wish. Bruce Lee, in fact, encouraged adopting many and any martial art that suits your personal interest and style.

I'm into Tae-Kwon-Do. But I need to work on my flexibility.
Also... I want to start practicing Muay Thai. It's way faster and more aggressive than TKD. Plus... I fought against a thug and my performance wasn't good enough as it should be for an advanced blue belt.

I had a friend talk to me about kendo which I thought sounded like me so I looked around for a sensei but alas, nothing in my area. I swear it's like the twilight zone of martial arts. I really love Mau Rakau but again, no kaiwhakaako to be found.

Demonstration below:

YouTube - Ngati tumatauenga Taiaha demonstration

muay thai
 

muay thai is awesome. Been doing it for 2 years and never looked back. I used to do karate but swapped to muay thai because i hated the patterns i had to do in karate. i also went and trained over in thailand for 2 weeks, it was good fun. I would definately reccomend it.

Right now for me its kickboxing

Japanese Jujutsu and iaijutsu. Couldn't ask for a anything more, my dojo also does karate which i also learn but not as much.

Any kendo/jutsu to go with that iaijutsu?

Muay Thai/Parad Serey. I havent been training in a long time but yup thats my background.