Gray Fullbuster

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He frequently teams up with Lucy and Natsu when they go on a mission. Natsu and Gray have a very brotherly, albeit competitive, relationship, with Natsu picking a fight with Gray whenever he says something that might be seen as insulting. Lucy theorizes that their constant fights are a natural byproduct of the magic styles, Natsu's being fire and Gray's being ice. He is voiced by Yuichi Nakamura (seiyū).

Gray was taught how to use ice-magic by Ur when he was a child after his parents were killed by Deliora. When Gray later attacks Deliora to seek revenge, Ur sacrifices herself to trap Deliora in ice and save Gray. During his training with Ur, Gray was forced to live in a snowy region wearing nothing but his underwear in order to get accustomed to the coldness of ice. Because of this he has developed the unconscious habit of removing his clothes at inopportune times, as he is most comfortable without them. Gray is one of Fairy Tail's more talented mage, and he is able to form static formations of ice with relative ease. Unlike his fellow student under Ur, Lyon, Gray uses both of his hands when forming ice since using only one hand can create unbalanced ice forms.

Source: Wikipedia