Akakume Fusion ToolHere's another fusion tool I use. It's more interactive, so it can conform to your needs some.
Akakume's Fusion ToolIt's about 90% complete. The person who was working on it stopped a while ago. It's good for basic needs, though.
Keep in mind, the fusions that this site give you ONLY work if the demons it suggests you use are the level you find in them in the wild. So it's only practical for short term work.
DEMON REQUESTS THREADAlso, I'll post this. Kill showed me it, and the person running this is incredible.
Demon RequestsJust post what YOU want as a demon, and what skills you want on it. This person will have your solution and a whole plan for you to follow immediately if they're online (If not, then just check back periodically).
Specified format to use when posting in this thread:Your Character's level:
Target Demon:
Skills wanted on Target Demon:
Demons you want to use in fusing, in your list or otherwise (include levels):
Skills on those Demons: