With the permission from ! Here comes his character! This is Hamdirholm (Obviously) and he is good friends with Shadow since elementary school but 8 years ago, Hamdirholm moved to Ponyville. He heard that Shadow's parents were killed by one of his best friends and felt sad for his friend. He got a letter from Shadow which said that he was going to Ponyville so he can rebuild his life and accept the fact that his parents were killed. Hamdirholm gladly helped Shadow to get his stuff from Shadow's house to Hamdirholm's house and even let him go through a secret entrence so Pinkie wouldn't give Shadow a party since Shadow was trying to rebuild his life. Hamdirholm is also the only one Shadow still trusts since he knew that Hamdirholm would not do something bad to him due to thier strong friendship.
Hamdirholm is 18 years old but he is just 3 months younger than Shadow and he is the only son of the legendary war hero Bombing Crash who died 3 years prior to Shadow's parents' death so Hamdirholm can understand Shadow's pain.
Now to abilities!
Hamdirholm has trained with several weapons including Sniper rifles, Melee weapons, Rapid fire guns, Grenades, Rocket launchers and assault rifles. His main weapons are a AK-47, A combat knife he hides in his waistcoat and a revolver.
Hamdirholm is physically weak which means he is doomed in close-ranged combat and he has problem lifting away heavy objects that has fallen on him. But Hamdirholm has two things that makes really dangerous. His intellienge and His massive amount of magic. With his great mentality, He comes up with perfect strategies and has a gigantic amount of spells that surpasses both Twilight and Shadow. He uses his spells at the perfect moment to use it making him a great spellcaster. His spells ranges from Elemental control to Hovering to Barriers to Sensing other's magic amount to Lasers. He has also trained in Transformation that can change his body from a unicorn to pegasus but it only lasts 5 minutes or when Hamdirholm decides to drop it and then he needs to recharge his magic for 2 minutes so he can't use this rapidly. Now for relationships!

Shadow Bio: Hamdirholm and Shadow has been great friends since elementary school and even when he moved to Ponyville, They sent letters to each other so they can still have contact. He knows that Shadow is anti social but that dosen't stop Hamdirholm's friendship with Shadow. They have such a strong friendship that they protect each other no matter what happens even when Shadow went berserk during the Canterlot Wedding. They are both equal in battle abilities but Shadow uses more offense while Hamdirholm uses everything very balanced making him a all-around.

Rarity: They aren't that good friends since Rarity dosen't like that Hamdirholm refuses to test her clothes. And the fact that Rarity thinks he is dirty simply because he is the son of a war hero. (When i mean dirty, I mean covered in dirt dirty.)

Rainbow Dash: Hamdirholm dosen't like people that boast a lot and since Rainbow always boast that she is the fastest pegasus that means not so good relationship. He does like that Rainbow is loyal to her friends but that is not enough.

Pinkie Pie: He was trying to ignore Pinkie at first but they do become good friends later on. He was the one that told Pinkie not to give Shadow a welcome party yet since he needed to get used to the town and the ones who lived there but he was going to tell her when he thinks Shadow is ready.

Twilight Sparkle: With similar personalities means a great friendship and this is a good example. They are really good friends and their personalities really helps since they are both calm, has a liking to read a good book, intelligent, has great amount of magic and are both good idealist. (Hamdirholm is still better at everything mentioned here.) Hadmirholm is aware of Shadow's feelings for Twilight but he does not tell anypony about it since he knows that Shadow and Twilight needs time to develop there relationship.

Fluttershy: Since Hamdirhold is quiet, He made Fluttershy know more about him first so she could become better friends and that worked. Both Hamdirhold and Fluttershy are afraid of something, (Hadmirhold is afraid of heights just like the Golem Overlord from Chrono Trigger while Fluttershy is mostly scared by anything.) Both love animals a lot and they can stand up to their friends when they are in danger.

Applejack: Hamdirhold is very good friends with Applejack since they are calm, Loves peace and they are hard workers but Hadmirhold dosen't have a strong body like Applejack and Applejack was also the first pony Hamdirhold met when he moved to Ponyville. Hamdirhold will develop feelings for Applejack later on in the story but i am just gonna make it slow so it can be built up better.