Rather than different, I'd say it's a rewind of their personality. It's been hinted in the main series that in the past Opera was a complete menace of the worst kind in the past before Gramps reined him in. My guess is that the characters are more like their past selves...because Kalego hates working for Gramps even now, who knows how bad he had it when he was younger. lol That might be the reason Kalego doesn't work with his brother but for Gramps instead.What??? They doubled Iruma's cowlicks??? To think they changed so much...
But seriously... other than Iruma and his grandpa, so far, the characters are actually kinda different in their likes and motives...