Bolt Javelin sounds sweet. Looking forward to trying it.
Whip -- awesome.
Kinda like the idea of fireworks -- yeah, maybe high-stun and no or little damage. Maybe it just chaotically shoots around -- like 4 different missiles fly out simultaneously -- a bit of a dice roll as to whether it actually hits what you're aiming at (and may even hits yourself). Then because it's more of a dice roll as opposed to heavily skill-based, it'd allow beginners to wield it nearly as well as more-skilled players. So it'd look really impressive which would probably be fun for beginner players. But also it would have a low chance of causing much damage -- so it wouldn't annoy the better players too much.
Smoke Bomb would make some fun strategies, I think. I assume that a smoke bomb would occlude the characters and the environment underneath. I wonder about that versus something like "invisible potion" -- which would make the player who takes it nearly invisible.
One thing about throwables -- I do wonder if a hold-and-release-to-throw button mechanic would be worth trying for throw strength? Neutral, tilt, or air could then be used for some other throw-variation. (number of items thrown? curvature of the throw? etc)
For team-play especially, I wonder about something like trip-lines (which could be jumped over)