That's a good point!
In the Japanese version, Mikami uses words like "atashi' (feminine version of "I" in JP) and says dramatic things, but his tone is absolutely serious and indifferent/nonchalant.
We think it's an interesting juxtaposition within his character, but he may not be for everyone!
It's kind of an interesting play on the usual stereotype with characters like this - think Jinnia from Radiant Tale without any of his happy-go-lucky charm. We kind of dig it!