Kai is very serious in Beyblade because of his childhood.
He was very close to his father who just happened to enjoy making Beyblades for children. This fascinated the young Kai and from this grew his love for Beyblade. However, when his grandfather found out about his father making "silly toys" he said to either lose the Beyblades or the right to become heir of the company, Hiwatari Enterprises. In the end, Kai's father chose Beyblades because he loved to make little children laugh. Kai, devastated by his father's decision decided to destroy all the toys that "stole his father away". That is why Kai was so serious in Beyblade.
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Kai Hiwatari is 13-15 years old... basically a teen.
Kyoya Tategami or Tsubasa Otori. However, they both are friendlier than Kai.
Kai loses Dranzer in G Revolution because he is beaten in the match against Zeo, who takes Dranzer upon his victory. However, Dranzer is later returned to Kai by Tyson, when he beats Zeo in the finals. Actually Kai's beyblade falls apart after his match with Brooklyn in G-Revolution, and it seems that Dranzer is gone (Kai says "You're free"). However, it is seen that Dranzer is back with Kai in the last promised-friendly-match with Tyson.
In the first season, he wears arm guards, and in the 2nd and 3rd, he wears finger-less gloves.
It is called beyblade metal masters.