His 'spur of the moment' actions
I never realized this before, but now when i think about it.. Why is Tai so quick in doing something without thinking about the consequences? I think it covers up for his insecurity of fear because the one time he was afraid, he broke down. I think it's all what he does to keep on going on, and he would never look back. Just in case he really is wrong.
His hair
*daydreaming..* Ok I'll snap out of it. I think Tai's hair symbolizes his courage, it's very, well, big, and wild just like his personality. No, I'm not saying he's big.. ok that just sounds wrong. forget it..