Congrats on your first char, man

. However, we'll still have to work a little on some details. Oh, don't worry! This review can look a little long, but I assure you the details are simple and quick.
Hmm...well, almost all of them

You see, his age and his grandfather's is still an issue. Neither Lupus nor any other pony of darkness can be older than 27. We know, we know, the story of EoD is complex and full of details, but you really have to read it and understand it well to get the gist of the game and start playing. Please check the
G1 Character creation guidelines for the age issue. Wait, I'll just quote it here:
Though it may seem random, you can bet these age limitations for ponies of darkness are very well thought out to the last detail, and they're just logic. If you really understand the story of the Great Death, the pillars, the ponies of light and darkness, you'll see that these age limitations are just the logical conclusions

. Just remember this: Justice, who was born 27 years ago, was the first pony of darkness (well, the first one whose colors are OBVIOUS), and after her birth ALL PONIES were pillared by Molly and born as PoD. So no one can be older than Justice (except for dragons, ATEs, etc).
Now, how to solve this? Well, I understand that his grandfather's story is important for your char's background. Here I have a couple of suggestions. Read: you don't really have to follow these suggestions

You can come up with any idea you like as long as it fits within the storyline:
1) You could have Lupus be 27, a few days younger than Justice. That would mean he was born in 9 AGD. Hence he was 9 when his grandfather died. So, he would've been trained by his grandpa till he was 9 (I guess if he started at a young age, by nine he could've learned a lot already) and maybe he spent the rest of his life training by himself (according to your story, him being a warrior and everything). Maybe he's been hunting and fighting dangerous beasts in the Woods? Or you could've had him make trips to Shadow Forest, I assure you there's lots of training there, dodging tree spikes

).
(As a side note: you could maybe add how did his grandfather learn his "warrior ways"? The thing is...Ponyland before the Great Death didn't really have a war history, or fighters or warriors. Not many anyway. There are fighters nowadays, but they all have a background history to support them. I'd be very pleased if you could provide some explanation for his grandfather's fighting skills

) I mean, there are assassins and miscreants nowadays, but most of them have just learned to fight...in the streets so to say. Lupus and his grandfather sound a little as though they had learned a fighting sytem (Kung Fu like) from old. Correct me if I'm wrong here
2) You could have his "tutor" be a pony of darkness and someone different from his father or grandfather. Maybe an older brother? or an older friend. I have a similar background for one of my chars. At first I wanted to keep his mother alive, but I realized it was impossible, so I came up with an old friend (who is 27) and has taken care of him since then, like a big brother. Just an idea.

I know those ninja gauntlets

. I'm okay with this, as long as you reply Jennifer's question (give us an idea of how he would use them, perhaps an easy way to take them off and put them on? Remember our ponies have only hooves and teeth to do this), and remember that, when fighting, he has to move pony like. Ponies can rear up for a while and kick and punch with their front hooves, so I'm sure he can block and parry attacks (since our ponies are intelligent and can fight in a much more intelligent way than real horses), but when you rp him fighting, keep in mind he can't open his arms completely and do impossibly complicated movements like a human boxer or kung fu fighter.
His colors seem fine to me, but just in case, would you tell us the hex codes? You can use
this websiteor any other you like. To see the allowed body colors for ponies of darkness, check here:
http://mlpeod.9.forumer.com/index.php?showtopic=576
Aaaah... @_@, Colormist should check those. She's been a little absent lately, though...
So, please address these issues and I'll give my approval

If you have any other questions, feel free to ask!