Yes, when Tsuna is hit by the Dying Will bullet, he always "reborns," therefore leaving him in only his underwear.
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We know that Tsuna eventually ends up with Kyoko.
Yes, he gets a pet called Nuts or Na-tsu, which is obviously Tsuna backwards.
In chapter 352(at the end of the chapter),Tsuna found out that Reborn wasn't actually a baby. In chapter 353, Tsuna is still thinking about Reborn's adult form.
Byakuran and Tsuna start battling in episode 200 and the fight ends in episode 202.
Other wise known as " dame-tsuna" ( no-good tsuna ) He is a hapless boy with low grades and low self esteem. Until his mother hired him a tutor otherwise known as reborn and is a baby. He then knew that he is a boss of a certain mafia called vongola.