Insight is by far the simplest one in the bunch. I divided it in four ranks, depending on the amount of insight the hunter gets "In-game." I've given each rank a name as well as an added value for the hunter.
** From 0 to 10 Insight: Narrow Minded
Can see extraordinary creatures and read basic information
** From 11 to 30 Insight: Eye Can see.
Can see additional buffs on enemies as well as read more detailed Yharnamite texts
** From 31 to 50 Insight: Sagacious.
Can gradually see terrifying creatures and get closer to the eldritch truth
** From 51 to 99 Insight: Eyes Unveiled
The hunter finally reaches a level at which he can read all hunter writings and analyze the world around him better.
That's it when it comes to Insight. Of course, the Beasthood and Frenzy stats increase and decrease as in the game, depending on how much insight the hunter has got.
And as always, thanks for reading.