Heh, you are right. If I could compare my OC page, it would be to a garden that had been forgotten and full of weed that needs to be pulled.
About Discord being a vital part of my backstory. I, sadly, can't remove that. It's an important part of the backstory. If this brick would be removed, it would destroy the rest. But for the "if he knows you, how come he never mention you" it's easy, he thinks he killed me before the chaos era began (or at least imprisoned), and Missklang changed too much for him to recognise it, and some other reasons too. (or he forgot, or not aware i'm still here)
Age, I'm actually aware of that but didn't put it there, because I need to understand exactly how much time the era of chaos lasted. So I'll soon add that.
Now the dragon-pony part. Firstly, I must say, that my vision of a dragon-pony is based on Sparity from the "Crazy future" comic. Essentially what this means is that a dragon-pony have two forms. One "dragon-like" with wings and horns and claws and everything else, and the other "disguised" form in which the dragon pony looks...well...pony. The eyes, it's more like a distinct trait that cannot be removed. It's a bit like the animagus from Harry Potter, always bearing a similar trait to the human in the animal form. Also, I took inspiration from Mystique of the Marvel universe, who, even when disguised, sometimes have the eyes flash the original yellow colour.
The cutie mark, it's my favourite part. I did, after all, drew it first and made a character around that would fit it x3. As you pointed out, I did get the idea from BronyNotion's Discord cutie mark video. And as it turned out to be, it was a heck good of an idea. But you are right, maybe I should remove the "Discord cloud" part. I only put that there to have a full-text description of the image without showing it.
Now for the likings. Yeh, I figured "objectives and logic" look out of space. It is the problem on not fully explaining the character's mind and all that. It does make sense, but I need to bother specifying few things. It also works well as a secondary interpretation to the cutie mark which would then represents his personality.
Chaos magic, while in the show, only Discord appears to use it, in my tiny universe, there is different forms of magic. Chaos, "normal", dragon, channelling and so on. Discord, as well as Missklang, are what I call "Chaos entities" who can use said magic.
Fun... for my defence, I can object that some dislike seeing others having fun, like for example discorded Pinkie Pie. But yes, I want to remove that because redundant.
Discord... well, back in the day I used to almost worship him, but it faded away. I still like him, though, without excessive fangirling, however. I need to remove "Discord" from "likes". Missklang doesn't "like" Discord. He tried to kill him after all. (ugh, backstory that needs to be written!) but he doesn't "dislike" him either. I think. That's why the (under doubt) thing.
Dislikes emotions. Well, one can be too emotional, be aware of it, and thus disliking emotions which are his weakness. This is the case with Missklang. He thinks emotions prevent thinking rationally or clearly and conduct to an unpredictable behaviour which is unwanted. But he can't control himself enough to stop overreacting and attachment to ponies.
Cupcakas... Indeed, it dates from the time I discovered the whole "Pinkamena Diane Pie being an emotionless monster killer pone" thing. So I slapped that there reasoning that somehow, through 4th wall breaking, Missklang were aware of that, and thus scared his version of Pinkie Pie could go crazy like that too... But I need to remove that.
The backstory is undeveloped, true because I'm in process of making it... for a year now... I'm lazy. The draft that sits in the "backstory" section is more there to emphasise on the fact Missklang is rarely seen, and that he is ooooold. But you are right, it is a total disaster that needs to be either burned with fire or rewritten.
Bag of stuff, that's a bit redundant when you have chaos magic and access to hammerspace. I need to reduce that solely to poison joke bombs.
Pinkie sense... hmm I forgot I even put that there, I'll need to remove that. I never used that, so, TO THE BIN IT GOES! Wooooooooo gets dunked on! khm... I got carried away. Too much undertale in the character. Eh, as I told: I became slightly obsessed with W.D.Gaster when a friend pointed out that Missklang's last name "Dengeser" sounded a lot like "D.Gaster".
Also, for the name "Alscenia". It's complicated because it had to sound old-styled, to highlight the time period of her existance. It can, however, be shortened to "Alice" by close friends Alscenia is not that hard to pronounce though. Alsssenia xD