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Knight in Shining Armor/Prince Charming: One of the chapters is titled, "A Prince on a White Horse", and it is also who Nina thinks Tenma is, mistakenly thinking that he was the one sending the anonymous "romantic" emails to her when in reality the sender of the emails is Johan.
As for the Tenma of the original Japanese version, he was also Hei. And note the similarities between these characters, especially when their appearances change to make them look more badass.
If you had looked through the list of voice actors for the English dub, you — and especially if you were a big fan — will probably recognize a lot of names because some of the cast have worked in Digimon.
Thanks to an edited version of the first ED song beyond Viz Media's control, and with such a grateful fanbase as this series has, there's a good chance that there will never be an R1 Monster DVD Volume 2. It also doesn't help matters that Naoki Urasawa's works have never been successful in the United States.