Asura and Indra with their father.
As a child, Asura lived in his genius brother Indra's
shadow in every conceivable way, having displayed no natural talent
himself. Because of this, Asura came to realise the value of others and
their power of the many friends and allies he made before eventually
awakening his own power which equalled that of Indra's.
On his deathbed, Hagoromo selected Asura to carry on his dreams
of peace for the world. Indra, believing that he should have been
chosen, fought Asura to try and claim what he felt should have been his
birthright. His descendants — who would become the Uchiha clan — would continue this fight with Asura's descendants — who would become known as the Senju clan.[1]
Personality
Asura believed that love was the ultimate key to peace, and loved his father greatly as well.[1]
Though the son of the famed Sage of the Six Paths, Asura was born with
practically no talent, but because of this, he learned the value of
depending on and cooperating with others. Through sheer hard work and
determination, he was able to awaken his own power. Because he never
lost sight of the value in people, he would ultimately become the
successor to his father's ninshū as Hagoromo wanted the world to adopt this way of thinking.
Appearance
Asura had short, spiky hair, two locks of which were wrapped in
bandages framing either side of his face in a similar manner to his
brother. He also wore what seemed to be a blank forehead protector.
He wore a light-coloured kimono which was adorned with magatama around
the collar. The kimono was held closed by a dark-coloured sash.
Underneath all of this he wore a black full-body suit.
Abilities
Asura's battle avatar.
As a child, Asura was considered to be unskilled, much unlike his
genius older brother, Indra. Over the years, through grueling hard work
and dedication, plus support from his friends, Asura awakened his own
power: his father's "body", life force, and physical energy;
power equal to that of his brother's. He also became a capable leader,
obtaining countless loyal followers. It was this way of operating that
caused his father to make him the successor to ninshū.
In battle, Asura was seen encased in a three-headed, six-armed
avatar wielding several dark-coloured spheres. This avatar was capable
of going head to head with Indra's final Susanoo.[2] He also seen wielding a shakujō, as well as a sword on different occasions.
Legacy
The current inheritor of Asura's chakra, Naruto Uzumaki.
Hagoromo noted that Asura's chakra
remained even after his body was destroyed, and it was reincarnated in
various individuals throughout history who all inherited his will. His
prior reincarnation being Hashirama Senju. Naruto Uzumaki is the current inheritor of his will.
Asura's ideals also allowed his father to realise a new possibility for the world, and with this he used the Creation of All Things to separate the Ten-Tails' chakra into nine tailed beasts,
gave each of them names, in the hopes that when the time came, they
would to be reunited as a single entity, yet not as they originally
were, and that one shall appear at that time to show them what true
power is. The beasts would come to believe this individual to be Naruto
centuries later.
Trivia
The rivalry of Indra and Asura and their descendants (Uchiha
and Senju) is derived from Hindu and Buddhist religions where the Gods,
led by Indra, are in constant battle against the Asuras.
His battle avatar is befitting of his name, as Asura are often depicted as belligerent beings with three faces and six arms.
As Asura believed that love was the key to peace, it is possible that Hashirama Senju's "Will of Fire" evolved from his beliefs. Similarly, his brother's descendants rose to oppose this, inheriting the "Curse of Hatred".
Like his father, Asura wielded a shakujō in battle. His choice of weapon could represent his desire for love and peace, while his brother's choice of a sword could symbolise his lust for power.