She's brilliant - she's a pro at presenting on both the main show and the Side Show and has a real love for the show. I always see her interacting with fans on Twitter and in her pre-season interviews she always seems very passionate about the show (and about Big Brother in general).
I can't really compare her with Emma tbh - they're both brilliant and have a passion for the show, though Arisa's passion has shone more brightly than Emma's recently. Also I've met Emma before and she's one of the loveliest people you could ever meet, so I'd like to think that Arisa is the same

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