[Request] Making an event/NPC "That follow players instead of enclosing the PC"

I was thinking on making an event that will "Stalk or Follow" a player up to a certain range.
And when player moves, it also followed but not approach until it gets too close to the player.

Also if possible, trying to get away by distancing itself to a certain range from player when they're too close,
or perhaps would just wait or moving randomly without going too far from player when in specific range.

Ofc, without plugin if possible, but if plugin still required, please suggest me some.
I am planning on using "yanfly chase player" if I can't do it without plugin...
Still lack of JS/scripting experience here.

Thanks for reading!

@uglywolf You might like to edit your title which is somewhat misleading and which some may find offensive.

@Kes
I thought on making it sound simpler and a foolish pun. But I guess being stupid won't get me anywhere here. Thanks for the warning, I'll be more careful from now on.

edit:
Never mind
I've ran out of time. Thanks for the heads up.