I commented most of this on another durian suggestion, here. https://www.reddit.com/r/minecraftsuggestions/comments/11isxde/durian_tree/

The durian tree grows frequently in jungle biomes, growing up to 40 blocks tall. I don't know if durian wood should be its own thing or not. If planted outside of the jungle, it's average height will only be 20 blocks tall. The fruit will grow in pairs underneath the leaves of the tree. The fruit is a spiky block the size of a player head. It does one heart of damage instead of half like the cactus. After it ripens, you will cut it down from the tree to harvest it.

With the durian fruit, you can make an odorous potion. This makes you easier to detect by other players by letting them see a glow effect around you, but it repels some hostile mobs.

To harvest it's resources, you have to split the fruit open with a sword. This gives you the fruit and two shell halves, also making this the only block affected by looting.

The shells can be used to cover a shield, making it thorny like the thorns enchantment, but the shell has a seperate durability from the shield, and the shield will change back into a normal shield after losing a total of half its durability. This means that even if you have mending, the durian coating is not permanent, and you will have to reapply it in a crafting table, losing the enchantments. This balances the effects it would have on PvP.

When held, the fruit will be the opposite of wheat for cows and carrots for pigs, repelling these passive mobs. Maybe if place the fruit in an item frame, it will repel the mobs like you were holding it.

The durian fruit itself could act like a cactus that can be placed on top of any full block, and put up on walls to make mob farms better.

If you break the leaf block above the fruit, or any other block supporting it, it will fall like sand or an anvil, dealing the same damage as dripstone.