I’m glad his slangs shine through and add to his charm. Honestly, while writing his dialogues, as a fellow SE Asian myself, I’m deeply aware that his speech could sound incorrect to some if not sounding like a caricature/stereotype.
Still, I believe that by embracing his Manglish speech, Raymond can be unashamedly himself, like, if he already speaks like that, then let himlah! Can also, what?
And yes, Otto is a dumb-dumb but I admire his pure intention.