But that sometimes needs reinforcing


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He stayed at the company and went on to create a character that was more human than insect,
one that embodied the spirit of hope that children of all ages possess, but that sometimes needs reinforcing.
(Source: 'The Disney Way by Bill Capodagli & Lynn Jackson)

What does 'that' in 'but that sometimes needs reinforcing' refer to?
The whole creation work? The character? Or something else?

Thank you.
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