Arme vs. Any character
If your opponent is standing on a platform above you, preferably one with an edge so you can "swoop-slash" (aerial attack) on, you can grab them similar to how a Ronan/Elesis can Shadow-step and aerial grab someone. Simply use your aerial attack so that it lands you on the platform... Then keep the Z held down and quickly press the arrow key. If you do this quickly enough, the aerial attack should hit them... But instead of them falling down, you'll grab them.