[@McHaggis]Poka said in the chatzy that I had two options. 

A. I could use the existing lore from the potterverse, but I had to stay true to J.K's interpretations of them. So in the case of the wood nymph, I couldn't use because it was already an established being within the potterverse and much too small for it to have breeded with the human.   

B. I could use a non-exsisting lore not interpreted in the potterverse as long as it wasn't anything too far-fetched and it made sense and was done tastefully. So of course, I couldn't say something ridiculous like he was half chupacabra. lol But undines are very human like and there is lore behind them having offspring with humans and I believe I tied it in accurately into Hope's story. 

But I am sorry tho. I might have been a little too over zealous to put my app in the character section. I should of waited until Poka officially approved it. Sorry bout that. I just got really excited last night!