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Lambo and I-Pin have a sibling relationship. Lambo is often seen stealing sweets from I-pin, which he will later claim are his sweets to begin with. While his 5 year old self never says or does anything nice to I-Pin, his future self refers to her as "Charming." I-Pin has shown to care for Lambo's well-being either her 5 year old self or her future self. They always stick by each other's side.
Lambo always drives Tsuna crazy, always bothering and annoyed him to no end, constantly asking him to play whenever he feels bored and show no respect to him, calling him "No Good-Tsuna." However, his future self said that he never regarded him as his boss but more like an older brother, thinks of him as a great brother. Tsuna also worries over Lambo's well-being and reluctant to drag him into battle, always trying to avoid him from it and will save him if he's in trouble.
Lambo is really attached to Nana who he refers as "Mama" and is constantly being spoiled by her. Nana is also the reason for his ability to emit flames when he fought Kikyo's Box Weapon. Nana treats Lambo kindly like he's her own son and is always patient with his behavior.
Both have somewhat brotherly relationship; Lambo and Gokudera bicker constantly and call each other names (Gokudera refers to Lambo as "Stupid Cow" while Lambo refers to Gokudera as "Stupidera"). The two share little respect for each other but at times Gokudera can be very protective of Lambo.
Lambo shares a mutual disliking with Lampo, due to the latter seeing him as an immature, petulant child. It causes the two to always get angry or annoyed whenever they meet. Lampo has stated that he hates kids, especially kids like Lambo whom he calls a "snot-nosed brat" and refused to deem him worthy before he even tested Lambo. Lampo nevertheless deemed the boy worthy of his inheritance when Lambo used stored-up electric energy in his horns to protect the rest. Ironically, Lambo and Lampo are almost the same in personalities: annoying and unwilling to fight his own battles.
Kyoko, Haru, and Lambo are close and are usually always together. Haru hates whenever anyone hits or harms Lambo, such as Gokudera who is always picking on him. However, one time Haru choked Lambo by hugging him too tightly. In the future Lambo is always seen with Haru, Kyoko, or I-Pin. Whenever he is bored he goes to Haru, Kyoko, or I-Pin to play with them.
Lambo took a quick liking to Rauji, which Rauji returns, and ever since then they get along pretty well and always play together. Rauji's very patient with Lambo's attitude and doesn't seem to mind when Lambo claimed him as his subordinate. However, Rauji showed no hesitation to kill Lambo at the battle in Simon Island as his Family is much more important than Lambo. However, they later reconciled after all the misunderstandings between the two Families cleared up and often play together again.
Weapons and Abilities
Techniques
Gyuudon
Elettrico Cuoio: Due to being struck many times by lightning, electricity passes right through Lambo with little effect.
Thunder Set: Adult Lambo summons lightning and stores them into his horns to use the collected volts to attack.
Elettrico Cornata: After using Thunder Set, adult Lambo can then charge his opponent in an attack called Elettrico Cornata. It's weakness is it's short range but 25 year old Lambo can project the electricity much further.
Elettrico Reverse: A technique used by 25 year old Lambo where he releases stored electricity into the ground.
Corna Fulmine (Lightning Horns): Only with Lampo's Shield, the shield unleashes powerful Lightning Flames to defeat the enemies around the user. The flames released are so solid and thin that they are able to pierce through an enemy like shrapnel.
Wide Horn: While in Cambio Form (Vongola Gear Version), Lambo can make his horns larger than usual.
Corna Molla Elettro Shock: From the curled horns of the new Cambio Forma, extremely fierce electricity is generated which in turn becomes an electromagnet.
Ironhorn Electorico: 15 year old Lambo melts and solidifies the iron sand, creating powerful objects which he uses as projectiles.
Ferro Corno Electro Shock: Lambo creates two massive objects by using the Iron Sand, and then coats it with the Lightning Flame.
Horns: These horns can store and release electricity, acquired from lightning.
Ten-Year Bazooka: This switches the target with their own self from ten years later for five minutes. Every time Lambo loses his cool, he uses it on himself, switching with his 15-year-old self.
Cambio Forma: Lampo's Shield(Lampo is Italian for Flash): Gyuudon takes the form of armor and a Shield that covers Lambo's body. It also forms a helmet on Lambo with the Lightning Crest in the middle.
Thunder Helm Version X: Upgraded version of the Vongola Lightning Ring combined with Gyuudon's Box Ring.
Gyuudon (Version X): The Vongola Gear enhanced Gyuudon and is capable of merging directly with Lambo for his Cambio Forma.
Trivia
His catchphrase is "ga...ma...n" ("gotta stay calm," "endurance," "hold it in," or "tolerate," etc.), which he says before he cries.
Adult Lambo's catchphrase is "Yare yare" ("My oh my"), which he says before he acts.
He has a habit of saying "e gamo ne," "monya m," and "damone" at the end of his sentences.
He likes to speak in third-person, just like Haru.
He is nicknamed "Aho-ushi" ("Stupid cow"), by Gokudera.
Lambo has a deep connection with Tsuna's mother. Shown in the Future Arc where Reborn tells Ryohei how to make him use his cambio forma by asking Lambo if he wants to see Tsuna's mother again which makes him start to cry and activates his Lightning Ring.
In the Filipino dubbed version of Reborn!, his name is changed from Lambo to Rambo.
Lambo can only ignite his Flames when he is angry, sad, or homesick.
Lambo's favorite foods are grapes, octopus balls, and gumdrops.
Lambo's dream for the future is world domination.
According to Fuuta, Lambo ranks as the world's most annoying Mafia member, and is first when it comes to people wanting to kill him and use him as a seat cushion.
Future Lambo, Spanner, Romeo, and Lampo have the same seiyu.
15-year-old Lambo resembles Bianchi's ex-boyfriend, Romeo; Bianchi mixes the two up and often attacks 15-year-old Lambo.
Lambo and Romeo have the same birthday.
Future Lambo has a habit of calling Gokudera, "Gokudera-Shi."
Lambo can withstand enough electricity to power an entire town, while a normal person would already be burnt to a crisp.
Future Lambo is usually seen with one eye shut for reasons unknown, similar to the 1st generation Lightning Guardian, Lampo.
It is revealed that Future Lambo's pride is that he never refuses a single invitation to come out and party.
Adult Lambo always gets chocolates from ladies, and ends up getting a nosebleed from eating too much.
Lambo is the only 10th generation Vongola Guardian whose full name has been either yet to be revealed, or only has a first name.
In the most recent popularity poll, Lambo ranked 14th.
According to Chrome in volume 32 extra, Lambo prefers to sleep on the floor because the bed is too soft to stay still for him, just like Ken.
Future Lambo revealed that when he was 5 years old, all he wanted was to be like Tsuna and the rest of the Guardians and he wanted to do everything they did, because he felt lonely.
Lambo has really high "mafia hide-and-seek" rankings.
Lambo is the first to open his Vongola Box successfully.
In the Reborn! Fandom, his shorthands are either 'L' or 'Lam'
Lambo's ring is the only one not to get destroyed by Emma's Gravity Power in the Inheritance Arc.
Lambo is the only Vongola Guardian to not take any role in The Curse of the Rainbow Arc.
