I just wanted to tell, that I suggested Sonic merge together with Mega, I thought it was good as a reference to Mega's DoubleSoul, Soul Cross, and Cross Link abilities.
And, also, how about letting Mega, most likely, while under Cross-Fusion, use the Chaos Emeralds as a Power Boost, after he, Lan, and Sonic has found them, one by one?
Also, how about letting both Lan, and Mega get infused with Chaos Energy from the Emeralds, by letting Lan carrying them in, at least one of, his pockets, which can let them get their own version of Sonic's Super Sonic form, when they use all of the Chaos Emeralds together, at the same, by the Emeralds' combined Power Boost?
Also, how about letting Mega and Sonic use the Chaos Emeralds together again, once they collected all of them, by traveling all over the place, as in the planet, but, under the second time, let them be fused together, when they use them together, even if Mega's not Cross-Fused with Lan, then.

But, it might be better for you, to let MegaMan only use the Chaos Power Boost, while being Cross-Fused with Lan, as well as, when Mega's merging with Sonic.
Anyway, do as you please to.

I might not be able to make up a Neo-Darkloid for you, but maybe you can let Sonic, somehow gain the ability to visit the Net, so he can merge with Mega, both inside the Net, and while Mega's cross-fused with Lan. Also, how about letting a Chao, or maybe the "Chaos Creature", appear?

Sonic is able to beat Stormman without sweat, that is pretty cool and I am going to continue to read it continually. Thanks for uploading it!

Does the Darkloids had some connection to Black Doom or Eggman somehow?

this was the best when is the next one