I was thinking that to change a lion's personality while their still a cub without spending GB would be nice. Like, having them take care of a mouse would be cool. You could get a incounter like this:
You spied a mouse creeping along the edges of your territory. This could either be food, or a learning experince....
(Kill) (Give to a cub)
Choosing the kill option would add it to your hoard
Giving it to a cub would show a drop down menu with your eligble cubs (2m+) and their personality.
Or this:
[cub name] found a [beetle or mouse] in their den. They begged you to keep it. Pweeeeeaaaaseeeee?
[Yes] [No]

If the Mouse/Beetle dies of neglect, there will be a message like this:
[Cub name] has come to you with sorrow, with their [mouse/beetle] held carefully in their jaws. It appears to be [starving/thirsty]. Sorry.
They have a 20% chance of their personality changed to one of the kind options

How long they live is a random number like the number of cubs
Then, if they die peacfully:
[Cub name] has come to you with sorrow, with their [mouse/beetle] held carefully in their jaws. It appears to have passed away peacfully.
They have a 40% chance of their personality changing to one of the kind options.

It is a 50/50 chance of the animal dying and he animal living, FYI.
Suggestions:
What if the mouse could have babies ;o
@Twerky
I think the mouse should be able to breed. i also think their should an icon so you can know which cub(s) have a pet(s). I also think the mouse when breeding should be a small chance of having a mutation like piebald.
@Menhit Face Enthusiast
maybe there can be an activity for the pets to be trained or for the cubs to take pets exploring, kinda like Beetle Grounds and Cub Training.

i think the base personality should have something to do with it as well. say a snarky or evil personality type actually has the chance of killing the cub pet. or a nurturing or fatherly cub has a higher chance of keeping the cub pet safe.
@rad.exe
Please tell me why or why not you like this. Thanks!