I'm going to agree with the other guys here that Zan as a whole feels kind of strange. He looks like a pale, six armed man wearing a turtleneck and orange cargo shorts. For an ex imperial bodyguard, that's a pretty drab outfit. While he's obviously rocking a complimentary color scheme, the orange and blue contrast slightly wrong in a way that I can't put my finger on. The two concepts that Snoogy linked are much more visually interesting. His ability effects also seem very basic, just some sort of fire that isn't really explained. Hopefully the animations will see some more liveliness, as they all look a bit stiff.
As for abilities, his kit feels very unfocused. He's got an ability to pull enemies together, and then one that deals area damage around him. Okay, pretty solid one-two combo. But then he also has a leap, so why does he need the pull if he can get up into an enemy's face that way? Even stranger is his ultimate. His survivability and damage is based around spinning on top of as many enemies as possible, so knocking everyone away from each other is shooting himself in the foot.
My non-expert suggestion would be to focus his kit more around the ultimate, as it's a fairly unique idea. The idea I'm going for here is a mobile brawler that's focused on 1v1 fights and pickoffs. He would deal decent single target damage that grows weaker when there are multiple enemies nearby.
Crashing Wave is probably the weakest (synergy wise) part of Zan's kit. It feels a little out of place. In my mind the passive would cause Zan's weapon attacks to apply a small, stacking attack speed debuff. If enough stacks are applied to a target, and I'm talking somewhere around 10 or 15, then all stacks are removed and the target is disarmed for a short duration. Disarmed enemies can't have new stacks of the debuff applied until the disarm has worn off. The active component would become a short ranged dash to the target location, stopping at the first enemy commander hit, dealing damage to them and knocking them back. It should have a fairly small cooldown, and the push should certainly be weaker than Talo'Thrix's ultimate.
1000 Strikes could be unit target, rapidly striking the target enemy with reduced damage weapon attacks (something like 6 hits/sec over 5 seconds for 25% weapon damage each) and granting the armor buff and stamina to Zan that the current version does. If any enemies are near the main target, there is a chance that strikes may hit them instead. This would be the bread and butter of the kit. If the main target leaves a short radius of Zan, then this ability will immediately stop and enter cooldown. Since each blow is considered an attack in a fashion similar to Xenos' ultimate, it would allow Zan to very quickly stack up on-hit effects such as Crashing Wave's debuff or proficiencies such as Armor Shattering.
I wouldn't change Double Vault very much outside of visuals. The only gameplay change would be for Zan to leap to the opposite side of the target from where he started. Possibly applying a very brief yet potent slow to the target if it's an enemy.
As for the ultimate, the only change I would make is for it to play Duel of the Fates by John Williams for 30 seconds after activation. That alone would rocket Zan up to the top of every tier list.
The main combo of this version of Zan would be to Double Vault onto an unsuspecting enemy, Crashing Wave punch them away from their teammates/towers/units and/or into your teammates/towers/units, Double Vault back onto their new location, use Duel of Fates on them to prevent escape or knock other enemies outside of 1000 Strikes' search radius, then building up damage with 1000 Strikes. The target would have a hard time fighting back due to the Crashing Wave debuff constantly disarming them.
Wow, I got onto a bit of a rant there. I had no intention of this being so detailed and so long winded. I may also have come across a bit harshly about how I'm not a fan of Zan's style, even though I haven't gotten the chance to actually use him. I don't mean any form of personal insult from this. It's also entirely possible that Zan is still being worked on and this reveal was an in-development sneak peek, so maybe he'll end up as the badass six armed alien monk that the concept art suggests.