My list: Mechvibes (sounds when you click and type), reach circle (a outlined circle around players showing their reach), target information (shows health, armour, number of pots, gaps, etc.), Hotbar (A few cool styles to hotbar) Inventory (A few cool styles to inventory), and lastly my personal favorite Hit Sound (Ability to make a sound when you hit, like a ding and other modes, and another sound when you get hit, could be the same or something else)
#More mods
crisp mason
modern mountain
They won’t add mech vibes due to ably to fake clicking. Showing health, armour, number of pots and gaps is an unfair advantage and the custom sound you can use your own pack.(and maybe can use their better sound mod but I’m not sure)