Shadow being one of the strongest of the Clan, holds high authority and takes his responsibility seriously. He has a serious demeanour but is easily dumb founded when exposed to and form of female flirting. His personality was changed drastically by Natsu. He was once a shy mellow and sad person but soon changed and became a much more frienldy person.
Being one of the strongest members Shadow has a high battle power and large supply of chakra, he focuses on quick kill jutsu's and mainly relies on his lightening natured chakra to quickly slice his opponents to pieces. Shadow is driven to increase strength because although he may be a higher position he has a deep rivalry with Natsu which force the both of them to strive to become stronger. Shadow's battle style mainly revolves around attacking with electrified weapons rather than hand to hand combat, and because of this he is an expert with his sword and kunai.
Natsu, Shadow's first and oldest friend, as well as deepest rival, Natsu was the first person Shadow interacted with and as such became 'brothers' they have had many battles with each other with no victor and have also teamed up to take down many opponents, while personality wise they are polar opposites, they hold a deep trust and friendship towards each other and will always come through each other when needed most. Thet have many devestating team attacks that they have created while arguing with each other to take down an enemy simply because they would get involved. Though Natsu has stolen Shadow's girlfriend on multiple occasions, their friendship never wavered showing that they have a great amount of respect and loyalty for eachother.