It was discovered and named by Acacia, the god of food, about 600 years ago. Its classification is unknown, it has no genitals, and its method of reproduction is unknown. Although individuals are extremely rare, their lifespans are unusually long. It is also unknown when they began to live on the earth.

Mystery; according to a geologist, fossils similar to this guy were also found in the strata hundreds of millions of years ago.

It first appeared in the Food Pyramid, because Komatsu caused underground water to flow into its dry coffin, causing two of them to wake up (there were many coffins). One of them attacked Komatsu. Fortunately, Komatsu had the sonic armor given to him by Zebra.

Only one of them survived, and then Alu and Zebra tried their best to kill it, while the other one escaped.

Both IGO and the Gourmet Club have tamed Nitro respectively. In the Gourmet Memorial Chapter, a blue Nitro attacked and killed the dragon who was defeated in the battle with the three tigers.

In the comics, the gourmet aristocrat "Blue Nitro" appears, a more powerful and mysterious Nitro.

There are five Nitros that have been discovered, one appeared in the vegetable sky, two awakened from the food pyramid, one was killed by Aru and Zebra, and the other has escaped (currently the comics have confirmed that the escaped

Nitro is the delicious fairy Kaka, and there is also the delicious fairy Qianqian, who is also Nitro and is an old friend of Yilong. There is also the delicious fairy Jiji, who are called Gold Chef, Silver Chef, and Bronze Chef respectively.

Chef) Food Prison also imprisoned a cub. In Chapter 222, one was found to be bound by the Food Society, which serves as a trump card.

And according to the words of Chief Chef Assistant Nesni in Chapter 156 of the manga, the Gourmet Club also keeps several Nitros.

Blue Nitro has also appeared in recent comics. In the flashback, Yilong mentioned that Acacia deliberately colluded with Blue Nitro to act for the three tigers.