Why not add Capture? This is already a nice skill set and it can be a balanced one, maybe not in vanilla but in a mod yes, maybe also this make Locke more appealing than other characters but this isn't a bad thing. You go 3 skills, 2 defensive spells, one offensive and #7 should be his last skill learned since it's pretty powerful, you can't go really higher than this and not make the character OP. Other than Capture my second choice would be a magic based attack, this gives a lot of choices.
Note that having Capture could make Steal useless but you could add a downside to Capture such as higher miss odds than Steal alone.
On a side note, giving new animations to those skills will be hard without touching the animation scripts but copying / changing animation data only can give interesting results, while often not being perfect.
Note that having Capture could make Steal useless but you could add a downside to Capture such as higher miss odds than Steal alone.
On a side note, giving new animations to those skills will be hard without touching the animation scripts but copying / changing animation data only can give interesting results, while often not being perfect.