>>1666049On the table, to her left, is a Frog from Keroro Gunso. Under the table, the spherical thing is Haro (from Gundam), and behind the frog is some kind of Zaku, but I'm not sure exactly what type, although it looks like a MS-06SHAKU Zaku II Shaku Yumiko Custom (from Gundam).
To the left of the Lum Invader poster, in red and white, is Reimu Hakurei from Touhou, and beside her is a Kamen Rider mask (exact variant unknown).
It's a long shot, but the yellow thing behind Sonic might be Chiyo-chan's father from Azumanga Daioh