they're these little mechanical lookin bug typebastards based on mmo enemies or something. all of them are level 2 and have trash stats, and all of them have some annoying swarming ability that gets more of them. they depend on link monsters, which duel links doesnt support
"Sorry, Mokuba. It'd be really cool if I could actually be your friend and get a robot body and stuff, but this is an anime-only arc, so I can't actually have a lasting impact on the plot. Have fun"
I like to think that Gozaburo thinking Exodia Necross is good is proof that he actually fucking sucks at Duel Monsters and never really practiced it, so he just went "fuck, exodia beat kaiba, and this is like SUPER exodia. it must be sick as fuck"
everyone gets out but noa's like "yo yugi man, can you fetch kaiba? i know he's completely fucking insane and if you don't go get him he's literally just gonna go out summoning blue eyes"
kaiba's dramatic revelation is that if he just shrinks exodia he can kill gozaburo through it. which is really what happens when you play your shitty exodia necross in an actual game btw. you just fucking die anyway