I think this event would be optimized at 4frames/character...
This would allow 4separate characters to be placed onto one charasheet, allowing one charasheet to be used for all four main characters. This would create very easy accessibility in the coding, all the while, compacting space as you won't need anymore than one sheet for your jump graphics...
**A more high detailed jumping animation would be optimized at 5frames, but doing so would disrupt the flow of the 4characters/sheet, reducing it to three, while creating an empty space on your charasheet...
P.S.
Will you send me the graphic, so I can experiment??