In this chapter of Chainsawman I saw this 「いいっしょ」 and am confused by what it means.
Are there any other particles like this? I don't see this on any lists online.
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I'm not familiar with the manga, but this is likely a colloquial way of saying 「いいでしょう！」or 「いいよね！」.
Please visit here for a little more background (assuming characters are speaking one of the northern dialects).
Keep in mind, this is not a particle and not necessarily always sentence-ending either.