These next two requests are for Timon and Pumbaa. I am requesting them for Nala because I imagine they live in the outskirts of the Pride Lands, as far away from Scar and the Hyena's as they can possibly get. I picture them as survivalists trying to avoid Scar's rule for as long as possible. They are very close and the relationship they have is completely up to the people who pick them up. Tho they are from a different pride as Nala she considers them to be brothers in arms.
I picture the pair as befriending Nala while she was still welcome in the pride lands; perhaps she saved them from another predator that was trying to eat them and in turn healed their wounds. I imagine that while she was on the run she would come to them on occasion to rest but wouldn't stay long for fear of the hyena's finding her.
As for Timon, I imagine him to be the more talkative and smart of the pair, but sometimes his ideas can get them in trouble which is why he needs Pumbaa around to keep him in line. No one knows why he chose a meerkat for his skin but the reasoning is completely up to you.