Which challenge?

[NightWarrior4Life]

So I'm going to attempt some challenges and I'm not sure which one to start with. So how they work: I will start with a cat which will have kits named after the theme so the challenges are:
Space challenge
Plant and tree challenge
Rock and metal challenge
Elements challenge
Chemical challenge
Animal challenge
Action challenge
Rainbow challenge

Note: If you vote other and you have an idea you MUST leave me your suggestion else your vote will automatically be classed as the RAINBOW CHALLENGE

For example:
The space challenge begins with Sunkit Earthkit and Moonkit who can then gave more kits such as; Nebulakit, Novakit, Plutokit, Marskit etc. and you have to try and have as many kits with the names as possible so once you've run out of names and all your kits have grown up into warriors the challenge will be finished. You can attempt this too if you want! So because I will end up with so many cats, I am going to need things for them later on.

But I hope you enjoy this challenge too!

[NightWarrior4Life]

CURRENTLY I WILL BE ATTEMPTING THESE TOP THREE:
SPACE CHALLENGE
ROCK AND METAL CHALLENGE
PLANT AND TREE CHALLENGE

[NightWarrior4Life]

I WILL BE ATTEMPTING THESE CHALLENGES IN THESE CLANS:
RAINBOW CHALLENGE: RIVERCLAN (BONUS!) STARTING WITH REDKIT
PLANT AND TREE CHALLENGE: RIVERCLAN STARTING WITH CHERRYSKIP, OLIVESUN, WILLOWKIT AND MORE
CHEMICAL CHALLENGE: RIVERCLAN STARTING WITH HYDROGENKIT AND HELIUMKIT

ROCK AND METALS CHALLENGE: SHADOWCLAN STARTING WITH COPPERKIT AND SLATEKIT
SPACE CHALLENGE: SHADOWCLAN STARTING WITH MOONKIT AND SUNKIT
GEOGRAPHY CHALLENGE: SHADOWCLAN (BONUS!) STARTING WITH NORTHKIT SOUTHKIT EASTKIT AND WESTKIT

ANIMAL CHALLENGE: SKYCLAN STARTING WITH DOGKIT AND CATKIT
ELEMENTS CHALLENGE: SKYCLAN (BONUS!) STARTING WITH FIREKIT AND WATERKIT
ACTION CHALLENGE: SKYCLAN STARTING WITH LEAPKIT, STALKKIT AND POUNCEKIT