Hi, this isn't a fanfiction I just want to offer some ideas in case someone wants to do a kill la kill/Ed, Edd n Eddy crossover
Double D enrolls into Honnouji academy not knowing of the danger he is getting himself into, so Ed, Eddy and even Rolf decide to enroll with him to keep him safe and end up joining Ryuko and Mako in their adventures.
Nui survives the final battle but ends up in Peach Creek where she is found by Jimmy and Sarah and becomes friends with them.
Eddy is a student at Honnouji and ends up as Nonon's partner and later they fall in love.
The Elite Four come to Peach Creek High and end up befriending the kids of the cul-de-sac (including the Kankers).
Mako is revealed to be Ed's pen-pal.