He's a chainsaw weapon,
thought that was bad grammar then I realized we are talking about anime...
as long as they are fully dull and not attached to an actual chainsaw I believe you are fine- let me look up the official code for you though.
Edit: you fall under the last part of our prop law
Exotic weapons will be dealt with on a case-by-case basis. Do not bring weapons that Kumoricon staff cannot tell are fake from ten feet away.
Certain props are not allowed within the Convention Space. These include, but are not limited to:
Airsoft or projectile weapons
Live (sharp enough to cut) steel
Props wide enough or long enough to inhibit flow of traffic
Replica weapons that do not comply with state or federal law
Paddles (all varieties—including “yaoi” or “yuri” paddles)
Props which impede personal or public safety