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Perhaps you could use a different font for his dialogue. E.g. in "Asterix and the Goths", the Goth language is set in fraktur font. This would serve as a constant reminder of his weird accent; but...
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#1: Initial revision
Perhaps you could use a different font for his dialogue. E.g. in "[Asterix and the Goths](http://majorspoilers.com/2013/11/28/retro-review-asterix-goths-1963/)", the Goth language is set in fraktur font. This would serve as a constant reminder of his weird accent; but be sure to choose a font which fits his character, and still looks good when mixed with your normal font.