As of what does this have to do with ARMS? Well; the guy on the left is Springtron No. 1011's past self, Jonathan Ingalls -often referred to as Nathan.
And he lived a pacific human life; not many worries, not many obstacles... nearly nothing negative. And from what happened to be his final moments included the fifth -and last- Halloween he spent with Audrey -gal on the right- although it was the second Halloween they spent together now that they were lovebirds.