[@Wind Wild]

Fair enough, always willing to make adjustments. So let's see, starting from top to bottom:

I figured Fran would run into trouble (i.e. the rest of y'all) and get tangled up in that mess. Otherwise one could always pay for her services as a bodyguard or some such, so if you need an extra body for the rescue or to protect someone she's your demon. If you're particularly charismatic, she may even be willing to get paid after she works, though she would expect far greater compensation once her job is done. That way any charming or particularly pretty character could convince Fran to help and get involved with the plot. Aside from that, I'm open to suggestions.

1. I'm hesitant about the pants. Jk, jk, we'll give her something to cover her unmentionables. Though I'm not changing her character image. I think I could change the Holy Lock into something akin to a chastity belt. Cover's her unmentionables and makes it really hard to indulge in her more lewd acts. The horror!

2. I can just remove the size-shifting bit. It was a cool idea I wanted to try but I'm fine without it. Though I would like to keep her other shapeshifting abilities, just so she can pass off as human in certain anti-demon establishments.

3. This relates to her being a lesser succubus. Granted it's just my lore to it, so I'm always willing to change it if you'd like, but basically if Fran focused a bit more on strengthening her demonic powers instead of just rampant sex and fighting, she could create illusions simply through touch and such. However because she's never bothered to hone her magical side, what magic she does have is fairly limited. Hence why she can create powerful illusions, but she has to be very intimate with her targets. If she ever bothers to hone her magics, she'd be able to use similarly powerful illusions with far less restrictions. If that's not good, then I can try to change it to something else, maybe like forehead contact or needing both hands on her target (Hard to do that if her other hand is holding an axe).

4. Probably will remove/change the Holy Lock. See point 1.

5. Maybe the weight could be attributed to a different enchantment on it? For Fran specifically, it's fairly lightweight (For a weapon of it's size), but for everyone else it's about as heavy as it looks. 

Now onto Donny. I'm okay with getting rid of the secondary dangers of being somewhere that's on fire, oxygen and what not. As for the knife I can simplify that to just "It [i]really[/i] hurts demons". After all, his uncle gave it to him to defend against those creepy crawlies. Think of it like having a Holy Dagger +3. For now, I'd prefer if his essence and future magic is more around fire than wounds and what not. 

Also as for how Donny gets involved, I figured he may be making a delivery nearby wherever (Omnibites serves all over the world and beyond), and being a Samaritan that he is he goes and gets caught up in this mess. He miiiight get fired from his job, but for the greater good and all that.