"Child of Mercy", by Fayr Warning
http://www.fanfiction.net/s/2596747/1/
Young Harry understands things beyond his years. Things which change his outlook on the world, generally not for the better. This creates great changes in his world for years to come.
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"Gabriel", by Shikatanai
http://www.fanfiction.net/s/2695781/1/
FFNet summary: At 5, an abused Harry is taken in by a powerful family. Taking the name Gabriel, he grows up into something very different. How will Hogwarts react? Soldier!Harry, Neutral!Harry, implied child abuse.
http://www.fanfiction.net/s/2596747/1/
Young Harry understands things beyond his years. Things which change his outlook on the world, generally not for the better. This creates great changes in his world for years to come.
-----
"Gabriel", by Shikatanai
http://www.fanfiction.net/s/2695781/1/
FFNet summary: At 5, an abused Harry is taken in by a powerful family. Taking the name Gabriel, he grows up into something very different. How will Hogwarts react? Soldier!Harry, Neutral!Harry, implied child abuse.