Missing:

• The couple below those big gundam
• The boy with sun (symbol) headband, below Ichigo (Bleach)
• Pink pig with blush sticker near Luffy (One Piece)'s fist

Edit:
Update tag & note. Only 2 missing.
Thank you, Henyo :)

Edit 2:
Update tag & note. Done all.
Didn't know there's a anime version of Condor Heroes.
Thank you, askance :D

the boy with the sun : Granzort's MC i think
the pink pig: isn't that Tokyo Pig?

I know I've seen the show with the couple below the Gundam. I can't remember the name of it. the only scene I can remember is them spending a while hyping up a guy that fought with a calligraphy brush who then proceeded to get owned by the bad guy's henchman (who I can remember nothing about). This was not an important scene and was like 20 episodes in but it stuck with me. I remember at the beginning the woman teaches the man martial arts and then they fall in love and then the man goes out into the world to do stuff, and I don't remember why the woman didn't go as well but I remember being annoyed by her staying behind. It is roughly 17 years old.

Marvel Studios: Infinity War is the most ambitious crossover in history. And we gave you an awesome childhood.

Japan: Hold my sake.

My childhood in one picture.