Due to how threaded def tampering through hypernull works...its best that you place lleh_.zip in the final slot of the roster, just like you would with Metamon.
Sorry but couldn't really find a countermeasure myself, perhaps the likes of take might help with that?

Also, sorry if the whole roster (including _hell_) is replaced, that's just a random bug so restart mugen until he works.

If a crash occurs right when mugen boots, might be environmental differences.

Happy halloween!