Epic Battle Fantasy/WMG

Akron last awoke when cats were the dominant civilization
They managed to, but their advanced civilization was destroyed in the process. Over the ages, they have slowly begun to rebuild their civilization, but humans have out-paced them and become the dominant life-form.
 * The heroes might even be the ancient feline counterparts to Matt, Natz and Lance (the Lance counterpart leaving his/her tank behind... just to be destroyed by the trio we know.) Possibly even an ancestor of NoLegs, too...

Oblivion is Akron's rival
Oblivion is the super form of the final boss in 3.3, and represents omnipresent destruction, a counterpart to Origin of Life, who represents creation. Obiivion's been around since, possibly, the beginning of time, and Akron's been around for millions of years. Both seem to exist obly to destroy, and both are very powerful. It only makes sense that they would be enemies or rivals of some sort.
 * With Godcat confirmed to appear in EBF 4, it is possible that rivalry may have shifted to the heroes who outright KILLED Akron.

Anna has only recently taken up a forest life
Anna is an all around Nature Hero who uses a bow and actually has smaller breasts than Natz... But in the first EBF an NPC in a shop with the same hair and larger breasts appeared. Leading on from this, it is possible that Anna, like Lance, acted to help stop the chaos that was raging, and took to the forests to train herself in some form of combat. As a result she lost some weight and the only place that could leave from comfortably is the breasts. She then encountered Matt and Natz at some point before EBF 3.3, and joined the group, having helped them before by running a shop. She brought a bush with her since the others had some sort of non-human companion with them (Matt = NoLegs, Natz = the mammoth, Lance = Scanbot, which they found after defeating Akron.)