When we had the official version in which the End came out I was excited, but when 1.9 came out I went and checked out the End again, I was so excited. But over time were at 1.16 and nothing new has come up. So I got another idea for a End mob "Hornwort"!
Hornwort is considered a neutral mob in my books, this mob is always calm towards the player. Which is when you destroy something they love, which is Chorus Trees. Speaking of Chorus Trees, Hornworts would spawn in the infinite End, not the main island itself. If you destroy a Chorus Tree in a 55 Block radius from a Hornwort, they come charging at you and if they hit you they deal 3 ½ hearts of health to you. There is a catch however, you can breed these creatures. Yes, you can breed them. Just give them Chorus Fruit or Popped Chorus Fruit (It doesnt matter) they will breed. There's also 2 things special to these creatures, if they come into a radius of Enderman they will attack them. And another thing you can do with Hornworts, you can shear their bodies which can contain 1-3 Chorus Fruit, they will immediately get angry though and chase you. Also as a design note, they will look similar to Hoglins. But purple, pink and white, and have Chorus Fruit growing off their backs, have 1 horn on its face, and have 6 legs. I hope this a good idea for filling the End with various new mobs.