Hello, do you guys know any manga that have plain looking boy as the love interest or maybe the protagonist?
I dont want the kind that if he takes off his glasses he'll be super handsome or something. Im searching for character that doesnt have much presence or simply average like the background characters.

Shoujo or josei is fine. Thank you!!

Saruyama!
Beniiro Hero (I think)
My Hero! definitely
Houou Gakuen Misoragumi
Nakanmon! (I think)
Hirunaka no Ryuusei maybe?

Hope I helped

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"The great man is he who in the midst of the crowd keeps with perfect sweetness the independence of solitude." - from Self-Reliance by Ralph Waldo Emerson

Here are a few, hopefully they are plain looking/absent of presence enough:

Complete

Kingyo Sou
Tada, Kimi o Aishiteru
Taiyou no Uta (Kinda since you don't know too much about the main guy)

Ongoing

Yesterday o Utatte
Koe no Katachi
Baby Steps (More sports than romance)
Spice and Wolf
Natsu no Zenjitsu

It was much more difficult going with the premise of lack of presence than plain looking.

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Must Read Webcomic:
Unsounded

Lists:
Reading
Complete
Western Webcomics

Maybe Aozora Yell

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My current top 3:
Fullmetal Alchemist
Pandora Hearts
3-gatsu no Lion

Well, you didn't specify romance so I hope you are okay with this
Kuroko no Basket, it's a sports manga and the main character's whole thing is having 'no presence'. Sorry if that wasn't what you meant.

Hmm I'm ok with no romance but for now im searching for romance manga;; but I read and watch Kurobasu as well! sorry for not specifying the genre. But yes, Kuroko is a good example ^^

And thank you for the suggestions everyone!! I'll check them one by one ^^ If you have any other suggestion, please just tell me. I would like a male lead that totally looks like a background character www