Ok - well there is not much about the vongola bosses but here is some info about them XD
Giotto a.k.a. Vongola I [Primo]
The first head of the Vongola Family, who Tsuna bears a striking resembling to. He started the family 400 years before the start of the story. He retired early and moved to Japan where he started a family which eventually produced Tsuna, making him Tsuna's great-great-great grandfather. He and Tsuna both use gloves as their primary weapon, however, Giotto's gloves has an 'I' engraved on it, which represents the number '1' in Roman numerals.
Vongola II [Secondo]
The second head of the Vongola Family. He first appeared in the imaginary dimension where the previous Vongola heads gathered. His Dying Will Flame became known as the "Flame of Wrath", which Xanxus, who coincidentally looks similar in appearance, inherits.
Vongola III [Terzo]
The third head of the Vongola Family, who uses knives to fight.
Vongola IV [Quatro]
The fourth head of the Vongola Family, whose main weapon of choice is a fork. [Random - i Know]
Vongola V [Quinto]
The fifth head of the Vongola Family. He is first seen during Tsuna's training, where the previous Vongola heads gathered. He is also seen to be holding an unknown flaming weapon.
Simora a.k.a. Vongola VI [Sesto]
The sixth head of the Vongola Family. Other than wearing a monocle and holding a flaming weapon with decorative carvings, not much is known about him.
Fabio a.k.a. Vongola VII [Settimo]
The seventh head of the Vongola Family, whose flame was considered to be weak in terms of the other heads. In order to counter that weakness, he used guns that focused his flame as his primary weapon. Although he had a weak flame, his mastery of marksmanship gave him one of the highest attacks out of all the Vongola heads. He appears in chapter 158, donning a fedora.
Daniela a.k.a. Vongola VIII [Ottavo]
The eighth and only known female head of the Vongola Family. She first appeared in chapter 158, and is shown with a flowery tattoo on her face, and an unknown flaming weapon. In a small family tree, she is shown to be the mother of Timoteo a.k.a. Vongola IX.
Timoteo a.k.a. Vongola IX [Nono]
The current head of the Vongola crime family. His age is unknown, but it is implied that he is becoming too weak to lead the family, which is why he searches for his successor. It is revealed that he has been plagued with problems concerning his legs, thereby limiting his mobility. He accepted Iemitsu's son, Tsuna, as the next head of the Vongola Family, but a fake IX that replaced him decided that Xanxus was more worthy to become the next boss. Not realizing this IX was a fake, Iemitsu argued, wanting Tsuna to become the 10th boss. Thus, the fake IX sanctioned the traditional Vongola battle; those who wield the same ring will have a one-on-one battle. The real IX was kidnapped by Xanxus, who had placed him within Gola Mosca, draining him of his life energy. When Tsuna sliced Gola Mosca's armor in half, the IX was able to use his flame to show Tsuna his past; the IX used to visit Tsuna when he was just a child. The Vongola IX's stamp is the Dying Will Flame; he marks documents with his flame, proving they are official.
Tsunayoshi Sawada a.k.a. Vongola X [Decimo]
Tsuna has been named the true successor of Vongola IX by the ninth himself, and was also supported by the head of the CEDEF, Iemitsu, his own father. Tsuna then proves his worth as the tenth boss by defeating Xanxus, and winning the battle for the Vongola Rings, as per family tradition. In the future, Tsuna undergoes "The Trial", which is an ancient tradition that each Vongola boss undergoes. After showing his resolve, Tsuna is recognized as the true Vongola X by the former bosses of the Vongola Family.
Although, since Timoteo believes he can still continue to run the Vongola Family for a while longer, Tsuna has yet to take power as the tenth boss during his current time (the time before he is transported into the future).
In the alternate future, Tsuna is revealed to have died. However, he was revered as a great boss, as his prowess in battle and his dedication to his family were known throughout the Mafia world.
[x] so pRetty i hAd to Kill iT [x]