the wig is usable as a Len wig~ (in fact i got a even shorter for my cosplay XD)
i think the only problem is the bangs which can be easily solved after layering it. (unless you're going for the more anime-ish/really 'accurate' with huge blunt spikes portrayal?)
I wouldn't recommend using gel for the spiking though, it gets shaggy just after being in place for a few mins. XD
as for the ponytail (i assumed his was just the upper-half head kinda ponytail?), i just wore on the wig and pulled it into a high ponytail rofl. somehow i hadn't had any comments of wig cap showing or anything similar for that matter.