User blog comment:Aznboychris10/Who is Natsu really?/@comment-115.133.206.14-20130617163028

Natsu is a Saiyan, every time he is close to death he gains some sort of new ability or power up.

Tower of Heaven - Eat Etherion(=Poison), gained Dragon Force. Oracion Seies - Hit by Genesis Zero, existence supposedly erased, gained ability to burn magic and new finishing attack. Tenrou Island - Nearly killed by Hades, ate Laxus' lightning, gained Lightning Flame mode.