Monster Tinder

[Amaterasu]

Graowr

[spoiler]

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Cyclops!

Specifically a japanese one. Cyclops monstergirls suffer not only from the stigma that is the result of their man-eating monstrous cousins, but also of the social issues that come with how they both look very similar to humans, save for their single eye. Let me explain: for a monstergirl like a mermaid, a lamia or even a slime-girl the differences are strongly visible, which makes them look different from humans. As a result, they are easy to distinguish from humans, this puts the latter more at ease. For someone with a difference that is invisible if you look at their back or anywhere other than their face, humans are more uncomfortable. As a comparison, ask yourself what would you be creeped out more by: a robot that is clearly a robot, with gears, metal parts and cameras for eyes, or an extremely humanlike robot that blinks, speaks almost naturally and exhibits emotions?
Graowr on the other hand is not only a monster herself and has thus the advantage of being kind of an odd one too, but she probably doesn't even know what racism is. Okay, maybe she knows, but I strongly doubt that she would exhibit racism herself towards anyone, especially another monstergirl. And that is what Cyclops needs: someone who will see her for who she is, who doesn't mind that she has one eye or ten, who won't first think the stories of Ulysses that they read in latin class when they hear "Cyclops", and who counterbalances her shy, friendly, worried and intelligent self with an open, cheerful, equally friendly and a little naive nature.
On the other hand Graowr would greatly benefit from Cyclops's smart thinking, her careful planning and seeing things from another point of view. No, this was not an intended eye joke. Being someone who jumps into the fray head first and worrying little about what's to come - be that in a fight or socially -, she can use someone who will watch her back and occasionally tell her to back out of a hairy situation.
EDIT: Forgot to add this bit. Why japanese? Because she would be the closest to Graowr to understand the "japanese tendencies" that come with being a Majin. I mean, it's right there in the name, they're "majins", not "demons".

Colonel

Okay, it's time for the cold hard truth on this one... I can't find a match for Colonel. I've thought back and forth, asked the failbro, went through what I had, and I couldn't find anything. I'm sorry Blarghman, but Colonel Sanders is going home without a waifu.

Allow me to explain: Colonel is a robot programmed to emulate human behavior and to be a perfect soldier. However he is unable to feel positive emotions, and only responds with emotion by logically deciding what emotion he should display in response to a certain situation. A transcript of what I was told by Failz is in the tab below.
The problem here is that Colonel is unable to feel positive emotions - happiness, affection, joy, interest, gratitude, cheerfulness, enthusiasm, enjoyment... the list goes on. Sure he can pretend to be feeling those emotions, but that's just not the same thing. It would at best be a one-sided relationship. And why do I say at best? Because Colonel would have no interest to be with someone who does not logically benefit him with their presence - he would not get emotionally attached to anyone. He would not hesitate to leave a battle-partner behind if their ability to fight becomes hindered by their emotions towards him and the resulting will of wanting to protect him, for instance. Plus, who would want a partner of who you know that they are not emotionally present?

Now there is hope... some computer crack who could program a new "positive emotions" module for him and somehow upload it to his drive whilst circumventing whatever failsafes a machine as advanced as Colonel would no doubt have installed, would be able to make him feel again. And perhaps a potent wizard/witch-type of character or similar magic-able caster would be able to turn Colonel into a more human form, which would naturally develop human emotion. Both options however would imply that Colonel gets changed, and at a very deep level no less. That's not what the spirit of Monster Tinder is: it's to find a match for a character the way they are, not the way they could be.

If anyone has a good idea, by all means let me know! I am kind of disappointed at myself that I couldn't find a good match for Colonel, but I'm accepting any input you may have on this.

[spoiler]Perhaps the biggest details is that, as might have been picked up, he's just a program. Albeit one meant to simulate and imitate humans perfectly, and be able to learn/grow like they can, as well. He was built to be the perfect soldier, with an attitude to reflect that. But somewhere along the line he had his kindness program ripped out, which took away his ability to feel 'positive' emotions, such as happiness and (true to its name), kindness. It made him overall much more cold and withdrawn, and several hampered -- if not outright destroyed -- his ability to properly empathize or emote, having to rely on logic to dictate the 'proper' emotional response or display. And he's also got the remnants and cyber-ghost of a virtual god that was nothing but a rampaging, bestial monster locked in his head.
....along with some serious family issues, from his kindness program getting reincarnated into his 'sister' and a failsafe installed so they if they ever spent too long together, or tried to merge to become complete again, they'd self-destruct.
He can kind of judge and know "I should feel like this. I don't, but I should. I think this is how I would act?"[/spoiler]

Alexander Anderson

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Battle Angel!

There's little in the way of discussion here: Anderson needs an angel by his side, a holy 'monster' girl that, like him, serves the Lord Jesus Christ. He's going to violently murder everyone else in a heartbeat.
Now in regards to the specifics, Anderson is a pretty straight shot as well: he's a grown man who really won't do with a girl barely of legal age. Taking aside that he may not even age because of his Regenerator powers and thus be much, much older than he looks, it would just not fit to pair him, a 40 to 50 year old man, with someone that could be his daughter, going by the physical age. Keep in mind that angels don't age either, so I'm going fully by physical looks here, not real age. (I couldn't find any better-fitting art in regards to age, sorry bout that. Just try to imagine that she's in her mid 30s and Anderson is 40-41).
Angels are a special bunch among monsters, as much as they can be called that, because they were once humans, before they died. This particular one, she was a devout servant of the church and the vatican, perhaps even someone who worked under Anderson at some point, and died in service. The dilemma she was faced with, as many others before her, was that despite her service to the church and her piousness her breach of the church's teachings, such as not to kill - much like Anderson, she hunted creatures of the night on orders of the Vatican - and to love her enemy - which needs no explanation - ultimately denied her entry to paradise. Instead of being cast down to Hell however she was allowed to join the "Battle Angels", a force of the Heavens that protects Earth from demonkind and is composed entirely of angels that will be denied entry to Paradise until... well, there are certain rules allowing for redemption, but that is a story for another day. And besides, Battle Angel would leave paradise behind any day to continue taking on the forces of evil as she always has.
Anderson is much like her, and he is aware of it: he knows that as a member of the Judas Iscariot unit he will be denied entry to heaven. But what he does not know is that after his eventual death he will be allowed into a new unit. And there it will be that Battle Angel reveals that, like a guardian angel, she has been watching over him for a time, occasionally guiding a misaimed bayonet into its mark for him or empowering his holy prayer magic with her own holy energy to increase his power, all behind the scenes, invisible to the mortal eye, even to that of a servant of God. If she knew him before her death she will also reveal how she has liked him long before her death and how her affection for him has grown only after that.
Anderson may be a lone fighter most of the time but a partner both in battle and outside of it will do him great good. She shares his devotion to God and they can affirm that every day by sinking their blades into the dark creatures that seek to invade the land. And as angels they are both very powerful, so he will not have to worry about leaving her behind. As with many characters, it will ultimately be up to the two of them whether they stay as good partners in battle, or whether it evolves into something beyond that. In either case it will be a great partnership.
Ayyyymen!