This video shows what I've found to be the easiest way to 1CC Espgaluda II, which is to use Asagi. The first 3-4 stages of the game become more difficult than the other characters, but stages 5-6 become almost trivial.
Apologies for the intermittent video issues; this was played on the original PCB, but also applies to the Switch and Xbox 360 versions of Espgaluda II. My OSSC acted up here and there which caused the video to flicker black and white at points.
At present, Hardcore Tanoshii has 500 views spread across 2 videos for Espgaluda II, with his channel currently having around hour worth of content for Espgaluda II. This is 1.74% of the total watchable video on Hardcore Tanoshii's YouTube channel.