Welcome! You'll love that Kawasaki.
This is an old list of mine that may give you some ideas. The things I ensure I have before I roll are bike, key, & gear. I sometimes throw in spare gear just because you can't get on track without all of it (maybe a note for later, once you're hooked...like we are).
This older list isn't complete for me. Not all of these are good ideas, they're just ideas.
Power cord for fan and warmers
Mobil 1 15W-50 Oil
Tire thermometer
Cable ties
Safety wire and pliers
Two mirrors
Plastic bag w/
Scotch-brite
Earplugs
Two Sharpies
Toothbrush for cleaning
Pen
Utility knife
Box cutter
Boot heel screws
Valve stem tool
Service book
Rags
White ruler
Flat screwdrivers (5-6)
Phillips screwdrivers (4)
Metric Allen wrenches, sockets, loose, and fold ups, and large 12/14/17mm sockets
Adjustable wrenches (3)
Handle 3/8 socket driver
¼, 3/8, and ½ ratchets
¼ and 3/8 extensions and elbows
Socket drive size changers
¼ and 3/8 racks of metric sockets
3/8” sockets- 5/8, 5/8 spark plug
½” sockets- ¾, 13/16, 22mm, 7/8, 15/16, 27mm, 32mm impact
8, 10, 12, 14, 15, 17mm wrenches
Needle-nose, cutting, vice grip, and regular pliers
Robo-grip pliers, wire strippers
Awl
Flashlight
Suspension adjustment tools
Plastic Tub
Tire pressure gauge
Electric Meter
Rubber hammers (2)
Two torque wrenches
Plastic bag w:
duct tape
electrical tape
sunscreen
pen/paper
gas can cap
syringe
tape measure
JB Weld
Never-seize