Arcane Melee Striker: This is the bladesinger or duskblade, relying on his weapon for melee and having some ranged spells and magical utility powers. A mix between swordmage and sorcerer. Possibly an arcane archer build as well. I have two ideas for how to stat it; either Dex + Int/Cha (choosing between sorcerer-like and wizard-like) or Int + Dex/Str (Wizard + rogue-like or fighter-like).
Mobile Controller: A martial artist, dance mystic, or dervish, similar to a Monk. Moves past enemies and allies, handing out buffs and debuffs and possibly taking some aggro as well. Needs to be in the thick of things. Leans towards either defender or leader depending on build. Dex + Con/Cha.
Martial Controller: Strong: Controls the battlefield trough strength. In many ways a reverse defender, this is a guy enemies do not want to get close to. Think Samson or Hercules from TV. If built as its own class, it should probably be Str + Cha/Con, but it seems a little narrow to be a separate class. I have made a build variant for this in the controller linked in my sig.
Martial Controller: Intelligent: Uses tricks, traps, or psyche to dominate enemies. A bit of a pulp superhero - The Shadow or the old Sandman (pre-Gaiman). Can also include some variants of the swashbuckler meme. See my sig for an attempt to build such a class that also has a strong martial controller build option. Int + Dex/Cha. The strong build would have to be Int + Str if it was included in this class.
Necromancer: A controller with heavy-duty summoning powers and debuffs. Allowed encounter-power summons. Perhaps Con + Int/Cha, depending on what the flavor of the shadow origin is.
Elementalist Controller: Wide-area battlefield control, causing mist, heat, hurricanes. Attacks would be like a toned-down sorcerer. Probably primal origin. Con, Wis, and Dex makes sense as stats.
Knight: A fighter rebuilt as a striker. Heavy armor, high damage, low mobility. Draws targets to him by challenges, something like a fighter mark, only single target and with more pull, less hold. Possibly a mounted build option which would still not be very mobile because mounts are all Large. Str + Cha/Wis/Dex (Dex for mounted powers).