spelunker helper/pet

 the design could look like a villager or similar to the player, i have a couple ideas.

the taming and attacking mechanics would be the same but  they attack like a zombie with a pic as a weapon,

once tamed they wouldn't be a llama/horse but another inventory and a portable lightsource

if two meet there's a slim chance they will like each other, if not they fight to the death and you may loose all the gear you put in him but if they do like each other they will both help you 

you find them in/near cave dens with special sleeping bags and a unique workbench or something similar, you could move these to move the spelunkers home and like dogs and cats tell them to stop following you but rather then sitting dead still they take the fastest way back to their den

this means you can use them to navigate home but they can never leave the underground otherwise they burn like zombies or if you take into sunlight they could run of with your stuff. 

Please help me get noticed and i will post some design ideas, this could be a game changer.