PataTail- This is also the type people tend to go for partly due to their partners being paired up so the digimon should be paired up too or due to the fact that they have angel forms is that why you like them together or are you not the type to fall into cliches?
I want to point something about PataTail as in replying that question too but with some personal thoughts about some things you mention on the question.
Actually PataTail isn't as tacked to Takari as we think. I did a search yesterday on fanfiction.net and while Takari returned 2004 results, PataTail only returned 61 results. is just the 3% of the total of Takari fics.
Those are just PataTail fics in which we see them as Patamon and Gatomon. In early years of fanfiction.net there were some Angemon/Angewomon fics but most of them weren't even inside the series timeline. I mean, they were in different scenaries like medieval era, fairy tales, etc. just using the characters from the series but there was one that wasn't even with the Gatomon and Patamon from the series though it had certain things from it like a Salamon who ended working for a Myotismon but it was all just with the digimon, no humans appear on it.
Still while in part you're right about the angels and crests, on the fics I have read, not all of them mention the angels or the crests.
Yesterday talking with a friend I actually realized that the angels and crests can give us an interesting scenary for PataGato fics. No, is not what you think of destined love and such, actually is quite a challenge.
The challenge in writing PataGato precisely with the angels thing and the crests, is a quite good source of conflict. You see, we can start the story with them feeling something for each other beyond friendship, but they're also afraid that it may be just reflect of their partners' closeness, or because of their angel forms, or the crests. That would make them not take the step out of fear that their love is merely influenced by those facts. At the same time they even can distance from each other because they won't know how to face all that. From there we can use several paths, like them trying to date other digimon, seeking for advice, etc. But at the same time the can't stop thinking on each other because crests or not or angels or not, they had been friends for years (here we can set the time to be some years after defeating MaloMyotismon to add a long going friendship between them), they care for each other, they had shared a lot. You have to admit they seemed to enjoy each other's company, so at least the chemistry is there. The main thing is that for love nothing is impossible.
Another scenary I might try to explore is from Patamon's point of view, on how he feels he doesn't has the necesary for a girl to fall in love with him, mostly when there are rookie level digimon that are better looking than him, stronger, etc. Well that would be what Patamon would feel. You know how in the actual world the looks and such had been taking force that sometimes we forget that for a love to be real there is also necesary the sensitiveness, care, to listen to your loved one whenever she needs to talk, etc. So taking that to a PataGato fic it will give us a Patamon sorting a lot of obstacles before he realizes what it is important in a love relation and that he doesn't has to be something he isn't.
Like those example, there are so many different scenaries to explore, many things to try but sadly a lot of fans doesn't like to think much and decide to use the easy exit
I feel is not fair how PataGato got stuck like that to Takari when it has a lot of potential as individual pairing. I did proved it in my fics. Two of my PataGato fics with very few chapters and still not finished got a lot of reviews. My best one is Gatomon's Baby which with just 4 chapters and still in the works, it has 115 reviews, my fic Rebuilding a Broken heart has 73 reviews.
But my biggest success would be my one-shot Patamon's first date; that one is a one chapter long fic and it has 41 reviews, and even though I posted it on fanfiction.net 5 years ago it still got reviews this year. Actually there hasn't been year since I posted it that it didn't got reviews, as in it has reviews with dates of 2005, 2006, 2007, 2008, 2009 and 2010.
In multichaptered fics, Gatomon's Baby is my best work so far. It has 13411 hits, it has been favorited 43 times and it has been put in story alerts 37 times.
Also to the current 116 reviews add another 100 reviews since this was the third time I posted it. the first time I posted it finished it got 50 reviews and the second time it got another 50 reviews too so between the 3 times it has gotten a total of 216 reviews.
The reason it is still in the works currently is because I'm revamping it, adding new chapters and new scenes on the old chapters too as a thanks for all the support. Let's just say that this version is like a DVD version, with never seen before material XD
Anyhow, what I'm trying to say is that due to a screw up of Azulongmon's words, fans attached them to Takari and PataGato, plus the angels thing but actually Patamon and Gatomon doesn't have all similar digivolutions. Remember the movie? while Patamon continued with the angel line, Gatomon's megaform was Magnadramon so that broke the rule.
Also an interesting detail is that while TK and Kari didn't saw each other in the 3 years of peace between both adventures, the 01 digimon remained together so that sure had helped Patamon and Gatomon to get to know each other more, and hence how Gatomon opened up to him without problem when something was bothering her or how she easily danced with him in episode 22 which the dialogs were different in the original version to how they are in the US dub. Gatomon said she wanted to dance but you could tell she didn't dared to do it on her own, you know, being the mature of the group and such, but it was enough that Patamon told her "shall we?" and they started to dance. She decided to let the mature side to go sleep and had fun
I'm not using it as evidence for romance, just to say that there was more than just the crests and the angels for them to work out the path beyond friendship, but sadly we know how fans go for the easy exit and this isn't only in PataGato, actually with VeeGato and other digimonxdigimon pairings too many fans say human partners hook up thus their digimon too, yet some of those fans doesn't like Takari because is destiny but then I ask, isn't a sort of destiny thing to pair the digimon because their partners hook up?