Cave Mobs: "Dasher" and "Slum"

Right now the only Cave mob we have is the bat and it doesen't have a drop or attack the player when near. I feel that there should at least be two more Cave Mobs Added (and then maybe more in the future) The names of these two mobs would be "Dasher" and "Slum". The Dasher Would Have 1 Heart less then the players natural health, damage will be 1 and a half hearts, on death the Dasher will drop coal and bones and have a chance to drop gold. hence the name, Dasher will be able to have longer sprint distance then the player making it difficult to escape from the dasher, also the dasher will have a minor speed increase. The Slum on the other hand will be slow and stealthy, the player will not be able to hear slums footsteps easily, slum has 2 extra hearts, slums damage is 1-half to 2 hearts of damage. slum will speed up once in a radius of 2 of the player. slum will drop a stick normally but has a chance of dropping a damaged  stone pickaxe.

 https://feedback.minecraft.net/hc/en-us/community/posts/360019066991-Making-Caves-And-Mining-Better-than-Before-