An average peon that almost any attacker can handle with relative ease. The actual danger posed by Sinner Snache is the potential Aftermath of killing it: a level 1 Surge deep in your lines, which can be problematic if this enemy is present in large quantities or buffed to an extent.
Due to how its most dangerous feature is the Surge that spawns far in front of it upon death, it is recommended to try and kill hordes of Sinner Snaches long before they reach the enemy frontlines, making Crazed Sexy Legs Cat, TalentedDark Lazer and Jellycat highly recommended against it. While countering this enemy should rarely, if ever, be your priority, this same strategy can prove beneficial against most Akus with the Aftermath ability all the same.
Its Japanese name, Inferunyoro, is a portmanteau of the word "inferno" and "Nyoro", Snache's Japanese name.
Nyoro is another name for a wave dash (〜) or tilde (~), which Snache and its variants are vaguely shaped like.
The information in its description really is useless: despite the flame, it doesn't take any extra damage from water.
Since its Aftermath only has a 50% chance of activation, it can have two different death animations depending on whether Aftermath activates or not.
This enemy can be seen as The Battle Cats counterpart of Shield Penan (the Metal variant of Penanggalan in YuruGeGe); both are peons that are only threatening because of the damage they cause when slain.