Overview
Hello there, Harley is NOT just a jungler anymore but can be a versatile mid laner capable of fast rotation.
Strengths
Early game damage may not seem that much but this should focus on fast rotation, invade, and pushing. Using Harley's 2nd skill, he can rotate to other lanes quickly, dive in to delete squishy heroes in the back line and escape.
Weaknesses
Item farming may not be that much at early and damage is not great but focus on team fight coordination. Mobile blink heroes may also seem to pose a problem but wait for the to use their skills while being hidden and attack.
Damage/rotation
Cooldown reduction for early game will be a big help! Then lightning truncheon for poke damage, glowing wand to mitigate magic defense and blood wings to survive longer. The last 2 items are standard mage items.
Midlane
This emblem is rotation focused and still aiming to get cooldown reduction and scaling when you secure core items
Battle Spell
Since early damage is a bit low, using and hitting flameshot with those affected by ultimate should add damage and hopefully kill your target
Early rotation/mid to late game
Early game should focus on fast rotation then wave clearing, go with roamer and jungler to secure lanes as early as possible. Rotate back to lane, clear, and repeat rotation. Getting OWN kilss should not be a priority but rather dealing as much damage as you can and rotating. Always wait in the bushes for sneak attacks and wait for lone heroes to waste their skills or spells then dive in and go for the kill. Your role here is to prioritize squishy heroes in the backline
Best With Carmilla
Carmilla's ult can help land multiple targets when you hit them with your ultimate, plus her stun and slow helps you keep the target in place to easier land your skills.
Watch Out For Lancelot
Lancelot's almost never ending blink is a problem. He CAN and WILL delete you easily if you engage without backup or recklessly.