I am looking for a couple, where both main heroes have a likeable personality and an interesting and "adorable" relationship. Age doesn't matter, though I don't like really big age gaps. Also, I don't mind anything except really sad stories, harems and ecchi ("boobs and butts in yo face" kind, although sexiness is acceptable)

For a girl, I don't mind if she cries a lot or if she's a lil stubborn but what I really do mind is when she's totally dumb. I'd like a herione with a strong character and spirit. She doesn't need to be tough or badass, just a girl with some brains and intereting personality.

For the guy, there are two options: shy or a meanie. Meanie =/= asshole, more like tsundere-ish. Also, should be considerate for the girl and kind of over-protective, not going overboard of course. And if he's easily flustered, that's a big plus.

Examples for relationships:
Ran to Haiiro no Sekai
Ran and Hibi are the perfect example for what I am looking for. Even if they're kids, don't care. Still enjoyed much more than some shōjo I've red. Also, Zin and Sango. Also, their parents. This manga was like christmas in spring to me.
Zettai Heiwa Daisakusen
Sarashi Asobi
Shiro Ari
Koi da no Ai da no

Maybe try:
Kaichou wa Maid-sama!
SA
Ojou-sama no Untenshu
Kyuukyoku Venus
Kisu yori mo Hayaku
Akagami no Shirayukihime
Kami-sama Hajimemashita

Hmm...likeable characters that have adorable relationships, okay, how about these:

Complete:

Nodame Cantabile (The guy is definitely the "cool" type who at first comes off as an asshole, but then he doesn't know the female mc yet.)
NG Life
Land of the Blindfolded
Cardcaptor Sakura (Fits exactly if you haven't read it yet.)
Double Arts (Sadly it was Axed, but the ending was still surprisingly good.)

Ongoing:

Kuragehime
Sekine-kun no Koi (Complete, just not totally scanlated yet.)
Takane to Hana

And if you don't mind the relationship not being adorable but still interesting there are these too:

Basara (Complete and a bit iffy on the male character since technically he's a bad guy, but he definitely is pretty good to the female mc.)
Ashita no Ou-sama (Complete)
Immortal Rain (Complete and there's kinda an age gap here, but he's immortal so...)
Mahou Tsukai no Yome (Ongoing and the world is as beautiful as the one in Ran to Haiiro no Sekai)
Cheese in the Trap (Ongoing and I personally find one of the male mc a tiny bit creepy/odd, but I haven't met anyone else who has.)

Also, it's easier to link manga if you just use brackets like this: [ manga title ] without the spaces of course. If you want to use urls, don't include the "https://" when using the tag.

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My Fair Neighbor They're adorable, but its only 2 chapters (scanlated), so I'm not sure if you want to start it.

Unfortunately, I've already read Cardcaptor Sakura, which is quite high in my favourite manga list, and Mahou Tsukai no Yome, which is one of my favourites. I agree that they would be a pretty perfect fit, especially because I love legends and spiritual stuff.

And thanks for the tip on the urls, I was trying to figure it out for a long time here.

W Juliet
Koukou Debut
Tokyo Crazy Paradise
Emma This is seinen but it's on romance
Magico
Otomen
Love Attack
Seishun Otome Banchou! The couple is kind of funny
Midori no Hibi This is a shounen but the romance is the main part
Kaichou wa Maid-sama I personally don't like it much though
Kimi wa Petto
Lovely Everywhere
Sugar Apple Fairy Tale not much romance but it's realllllly cute
Mars IDK, you may find the story a tad dark, but it's interesting
Guru guru pon-chan
Rasetsu no Hana
Kodomo no Omocha They're kids but the story is really nice

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Futari no Renai Shoka?

Last Game
Fuyu Hodoki
Otonari-san Game
Hajiotsu
Tsubasa to Hotaru
Mashikaku Rock
Cosmic Color
Akagami no Shirayukihime
Hoshikuzu Drop
Hibi Chouchou
Kimi to Yuriika
Tonari no Kashiwagi-san (a very slow romance, though..)
Honey (MEGURO Amu)
Vivid Cherry
Tsuzuki wa Mata Ashita (not couple, but their relationship is adorable)

I think a great example of a model boyfriend and girlfriend would be the couple in Kare Kano: His and Her Circumstances.

It even had an anime I think (though I didn't watch it).

Acchi Kocchi
Ann Cassandra
Angel Densetsu
Double Arts
Meteor Methuselah
Bonnouji Definitely this one!
Poor Poor Lips Yuri
Dengeki Daisy
Futari no Renai Shoka I like their personalities at least...

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