Puppeteer Ozodrin
A puppeteer is a psionic monster (aprox:
http://www.dandwiki.com/wiki/SRD:Puppeteer ), it's a fine creature which takes control of a host.
The premise is a smaller than usual ozodrin, this could mean a halfling ozodrin or it could mean a larvae ozodrin, either way it makes for some interesting usages of the features and augments granted. Some though put into the implementation of how this could be used from the inside of a dominated host is quite wonderful, and quite horrifying.
Undying Generations
Simply put, this is a way for the ozodrin to clone herself. Upon death the soul and memories, and in fact the character, is transferred into the host of an unborn spawn. The ozodrin can die after this and the player simply takes control over the spawn rather than the old character, this can tie into the above puppeteer ozodrin, or it could be more of an Alien stomachpopping experience where the ozodrin simply digests the creature it's inside, not that it couldn't be worked for a small or tiny ozodrin to do this to a helpless victim anyway. Perhaps a spike could be augmented to do this, via Slaad ability.
The player need to transfer their character to the new host, it could just be infected with the spawn parasite regardless.
Mind Altering
The ozodrin is horror themed, which makes up a lot of it's flavor, but most of the horror about it is external or rather it's based on how it actually functions and the lack of understanding people have towards it which makes it scary, I propose that we go one, two, or fourty steps farther into the deep end by making it's abilities directly effect the mind of it's foes.
Drawing off of real life, there's a wide variety of ways to do this, combined with fantasy the list improves dramatically.
Chemical effects in DnD are classified as poisons, diseases, drugs and alchemy. Poisons and diseases are Inhaled, Ingested, Contact and Injury, so that's a good starting point for anything that's used by the ozodrin as a chemical.
Inhaled can be done in multiple ways, it can be passive (such as stench), it can be an exhalation or a breath weapon. Alternatively it can be an Ex area effect if needed such as a trap can produce.
Contact can also be applied as a gas for the above options, but it also can be applied in liquid or solid form, or it can be a combination of any of those 3 such as a powder can be both a gas and a solid, or when the powder contacts liquid it can transfer states and become all 3, or a gas can be a concentrated vapor which solidifies.
Injury can also be used as a breath weapon as long as the breath weapon does damage as well, likely acid, piercing or slashing, but most likely it would be added to an augment of a feature that already does piercing or slashing damage.
Also, these mind effecting abilities may not be purely negative, nor do they have to be invasive, things like Moon Ivy armor produce passive gas chemicals which enhance the wearers abilities and effect on others.
Drugs may naturally be produced by the ozodrin, poisons and diseases too, the drugs may have mixed effects.
It's possible that the ozodrin can simply create alchemical compounds in their body, they already can create effects such as magical exploding spikes (such as with a +1 Exploding enchantment) so it's reasonable to assume that they could create more mundane effects as well.
To get down to it, the ozodrin by all means should be able to create mind altering states within those around it, if horror is your flavor then why not the Scarecrow Toxin (Batman)
https://en.wikipedia.org/wiki/Scarec..._and_abilities
If utility, or oddness is your flavor, why not pheromones which can calm or enchant those around you? This is a good way to create a false sense of security, it also has synergy considering the ozodrin is a Cha heavy class, besides, love is the drug that I'm thinking of.
I look at it this way, by using FP to BE the drug, you are essentially being more of a bard for mechanical purposes, the difference is that bards work on a moral bonus principle and only have a positive effect, this is traded for their limited uses of Bardic Music, drugs on the other hand are alchemical and are have inherent downsides to their use, or have a crash afterwords or an addictive quality. Being addictive... interesting.
This also has medical purposes, anesthetic, curative or other such abilities could be added in.