So, In your post you took each of my lines mostly out of context of the original intention, claiming I underestimate animal companions.
I do not underestimate Animal Companions. Animal Companions of a Ranger can stack with a Paladin mount. You could have a Large Dire Wolf as your mount. It was the glory of my last DM's favorite character.
True Neutral doesn't mean stupid, and just because an animal has a low Int score, doesn't mean they lack any desire to be cared for and treated properly. Not to say you can't train your koala, just that doing so in the context of an animal companion should follow the rules as such.
No where in the Pathfinder or D20 SRD does it say you get multiple animal companions. So only one of those Koalas should actually be as powerful as you claim. Maybe you have trained some Koalas via Handle Animal, but they would only have a standard amount of HP.
Since Koalas were requested and not actually an initial choice for Druids or Rangers, it would appear on the "alternative list" according to the D20 SRD. Meaning that your Druid/ranger Level would be subtracted by a certain amount for the purpose of adding power to your animal companion. Since Rangers' Animal companion Work like a Druids', Druid and rangers levels stack for the purpose of determining the "effective druid level" for determining the companion you can choose from and it's benefits. Rangers only get half of their level counted as Druid levels for the animal companion, plus the penalty for picking an animal from an alternative list. And since Animal Companions aren't expressed in the Number of HD you can control (as opposed to undead), you only get one.
Now, Let's say you went Beast Master (Complete Adventurer) as a way to get more "Animal Companions". This class's 'animal companion' class feature references the druid one and continues on to say, "If a beastmaster already has an animal companion from
another class, her Beast Master class levels stack with class levels from all other classes that grant an animal companion." However, this class does give a nifty bonus of +3 to your effective druid level toward your animal companion. It is not until 10th level of this prestige class that you can get a total of three more Animal companions. And every new animal companion you acquire via this class is counted as being owned by a druid of your effective druid level… at a penalty that is as much as -9 for the 4th one.
Now… assuming you got in the class at 2nd level because you took the requirements and your character has a high enough Int Score to not be starved of skill points elsewhere. At 11th level, you'd be an effective Druid level of 13, because your ranger level of 1 is divided by 2 and doesn't count. So You would have 4 animal companions appropriate for druids at the effective levels: 13, 10, 7, and 2. Not to mention any penalty you get from having chosen something from an alternative list that was approved via this forum. Assuming the Koala was worth a -1 penalty, that leaves you at: 12, 9, 7, 1.
So Koala 1 Gets:
| +8 HD |
+8 Natural Armor |
+4 Str/Dex |
Koala 2 Gets:
| +6 HD |
+6 Nat. AC |
+3 Str/Dex |
Etc.
That puts your weakest Koala with no bonuses, having a Max HP of 8 and other stock abilities for a Koala.
Now that we know what is likely your highest max without adding feats that give more bonus levels, let's see what else you need to do what you claim. The picture is of a feat called "Fling Ally". The pre-Reqs are "Hurl Stone" as a Racial ability or feat and 19 strength, OR the powerful build racial trait, which Ogers in Pathfinder SRD and d20 SRD lack. Basic Ogres don't have the Hurl Stone feat, thus you have to get it in order to get the fling ally feat.
Since you took flaws, you would have 5 Feats. One is used up for beastmaster pre-reqs, one is Hurl stone, and one is Fling Ally.
Now, Fling Ally Only lets you fling a koala a max distance of 15 ft unless you also got "Improved Rock Hurl", then the max is 20 ft.
While I do think the first thing that was really gotten right is that there is no mention of damage via throwing your allies at enemies,
"You make a ranged touch attack (against AC 5) to throw the ally to the chosen square. If the touch attack hits, the ally lands in the square you designate. If the touch attack is a miss, randomly determine in which square the ally lands, using the Missing with a Thrown Weapon diagram on page 158 of the Player’s Handbook. If the ally lands in a square that is occupied, she lands prone
in that square. In any case, the ally doesn’t provoke attacks of opportunity for this movement."
Let's Paraphrase this, if you hit, the ally falls prone in the occupied square, if not, they fall prone elsewhere. Now, assuming that the ally was thrown, they would be fighting from the prone position taking all penalties unless they took a full round action to get up (Provoking an AOO) or roll decent enough. That said, your Koalas cannot be used as sticky projectiles without taking penalties.
Assuming they are thrown with force because you -are- using them as sticky projectiles, a variant of down falling damage rules seem applicable. Also, Collision Damage would work along the lines the way damage works for being shunted as far as using an existing mechanic to explain.
You seem to like Pokemon alot, so let's make a nonsensical reference that has relevance. Pokemon Yellow gave you a Pikachu that got mad if you treated it poorly, lost, healed it, just about anything. While an animal companion is 'loyal' it is not dominated by you magically and has a will of its own. A Good Druid/Ranger cares about his companions and takes care of them, thus they stay. An Evil Druid/Ranger inspires fear in his Companion, or perhaps his companion, via the link, shares a common villainous streak. This is not to say that an opportunistic animal that likes to kill may not try to kill/run away his master some day if he is abused. The Same goes for a Good Druid/Ranger. Sure it is not mention in the mechanic, but it seems unlikely to train a badger to be punt like a foot-ball and the badger not feel pain or be upset for the way it's being treated.
As for your pop culture references, they more or less fall flat on their ass because of how silly they are. Kirby isn't (Dragon Magazine might correct me on this one) stated for DnD, Neither if Mew. While the Vorpal bunny is undoubtedly stated somewhere, it is a point of comedy by overpowering a creature of normal insignificance. Also, In -real- life Koalas don't get chucked by Ogres.
In review:
-Only one of those fluffy things is your Companion, the rest may be trained, but they're no where near the level of power your companion would be.
-I Told you a Prestige Class that will let you accomplish what you're aiming for.
-If your Character IS over level 10, why is he joining in on games with lower level characters?
-"Fling Ally" Does not work like a plasma grenade in halo.
-There is no mechanic for the disposition of an animal companion, but should not be assumed mindless slaves for any reason.
-Pokemon isn't the answer to DnD, and is not a valid point of comparison unless you are playing a Pokemon-based game.
As for whether your character works or not, undoubtedly it does; but how much of it functions according to mechanics, who knows.
