Well, the Sword of Seals did have a projectile attack so that would definitely be a part of his new moveset. Also, he would probably take some moves from his father such as that quick thrust move (it would probably work like Fox's Phantasm, only it would also set the opponent on fire), the ability to throw a javelin, and summoning a war horse. I also thought of a unique recovery move for him called "Wheel of Fire" in which the Sword of Seals goes on fire and he spins in a circle (much like Samus's Screw Attack).
Also, we now have 19 Knights of Elibe. It certainly is growing.