I am currently reading the manga 「咲」and the character 片{かた}岡{おか}優{ゆう}希{き} regularly ends her sentences with じょ and じぇ. I will give a few examples (each line isn't related to the next)
学食でタコス買ってきたじぇー
のどちゃんはホントにすごいんだじょ!
のどちゃんやっぱ強すぎたじぇ
そうだじょ
What exactly does this mean? Is it a dialectical thing? I don't think this is a "pronounce ぞ/ぜ as じょ/じぇ" since she is shown pronouncing ぜ in words that require it.