First off define what is considered a "kid show".
Are we talking Dora the Explorer...or iCarly?
Then define male/male and female/female characters being "attracted" to one another in kid shows. Are we talking simply having a character that has 2 dads? Or actually showing a lesbian relationship? I mean we are talking about kid shows right?
Should homosexuality be represented, if the story warrants it. Yes. Simply adding them for the sake of adding them doesn't do the representation anything more than a token gesture. That has been a long standing argument among black actors and actresses for decades.
The Fresh Beat Band has a couple shows depicting a background "dancer" in a wheelchair. On the surface, you think good for them. Then you start to think about it. What's the purpose? Other than to say, "See, we hire people in wheelchairs!" It becomes a token gesture.
I find it hard to think that any form of "attraction" or "sexuality" should be present in any "kid show". As stated earlier...define "kid show". I can see teenage shows, such as iCarly, or Victorious, or [insert tween show here] having a character represented in the story (not just a one shot deal).
But if we are talking younger, as in learning shows like Dora, the character of Boots has always been perceived as gay. Even some simple fun shows like Spongebob...it will come down to how is it represented. In 2002 some wacko Christian groups had boycotted Spongebob because they felt the main character was gay along with a pro-family video (which had zero reference to sexual identity in it) and would make your child gay. Yes, they said that it would make your child gay.
Decades ago (before the live-action movies) it was long held by fans that Velma from Scooby-Doo was a lesbian. James & Jessie from Pokemon always struck me as androgynous (the constant cross-dressing with James as a girl, and Jesse as a boy starts to lean them in that direction). There is even a scene in which Jessie and James show off their female drawn bodies to Misty, (yes, James was drawn with huge boobs in a thin bikini, fondling them).
Shows intended for a bit older and tweenies like Naruto had Haku and Zabuza. Though never directly stated as gay. Haku was intended to have a heavily androgynous appearance and was even mistaken as a girl. Heck, even Naruto himself has developed a power than transforms himself into a hot girl.
Shows like American Dad and Family Guy. Both I would consider not even close to kid shows, constantly shows Roger & Stewie respectively in varying forms of androgynous or metrosexual qualities. Plus a fully intended and now openly gay Xander from Drawn Together even had a story line which he came out of the closet. Again though, not a kid show.
For the kid shows, these are more subjective by fans than actual intended gay characters. If we are leaning towards more of a intended character in a kid show, it becomes harder to find and pinpoint. Waylon Smithers from the Simpsons is the only one that truly comes to mind, and it is still up to interpretation as he has yet to come out of the closet, even though the closet he is standing in is completely transparent. Tinky-Winky from the Teletubies also comes to mind. Snagglepuss from Hanna-Barbera, had qualities that could be considered gay, but never stated. Pleakley from Lilo and Stitch. While cross dressing has been used for decades as comic relief, Pleakley's intended like and want of cross dressing as a female sets off some signals.
There are plenty of gay archetypes and have been for years. The Smurfs have always been stated here. Vanity is the kind of gay archetype commonly presented by the straight entertainment industry, while Hefty and Handy are gay archetypes in the same vein as the Village People, with their extremely iconic masculinity, exaggerated to the point of camp. Don't misunderstand here, i am not calling these Smurfs gay...just gay archetypes. It must be noted that both Handy and Clumsy were shown falling in "love" with different female characters over the years.
Another is Peppermint Patti from Charlie Brown. The only Peanuts girl to have a deep voice, only wore pants (never shown in a dress), very tomboyish playing a mean game of football, and even picked on boys. She always hung out with that androgynous Marcie who calls her "sir" and she always wears comfortable shoes.
It's all in the intention of the story. Gay characters or perceived as gay, can both be useful story telling devices. The trick is to not blatantly add them for no purpose.
