I've identified all those I know and those I didn't from the tags.

I don't know who the remaining 3 characters are, the blue armoured swordsman next to Urameshi and the purple haired guy behind Taikoubou seem really familiar but I can't figure them out.

Although I'm not sure who of the remaining characters is from rakudai_ninja_rantarou. I tried to google search it but I can't seem to find out.

Added tag and note for the Seiken Densetsu III character, Hawk, who's standing between Taikoubou and Hanamichi.

Though his goods are supposedly cheap quality Doraemon's tools and items are probably powerful enough to defeat anyone here. Even Goku.

the anime during my childhood days (90s), awesome to see them all again.

I feel nostalgic... my favorite is still doraemon... even till now

Corrected Hamel's name. "Hameln" refers to the island where the mazoku make their home; his name was spelled in that manner in a fansub that made a translation error.

holy fuck my childhood