The Buddha or any Ararahnt would not have even a trace of “defilements” (greed, hate/anger/ignorance) left in their minds.
– However, Arahants may have some leftover habits that some people may consider unsuitable for an Arahant. There are some accounts of that in the Tipitaka. Once a young Arahant was walking with a layperson and they came across a mud puddle on the road. The young Arahant jumped over the puddle and the layperson immediately thought, “Oh, this bhikkhu cannot be an Arahant.” It turned out that the young Arahant had been born a monkey in the recent past. It was a “harmless habit” of his to jump over things at times.
– A Buddha would not have even such minor “character flaws.”
However, upon Parinibbana, Buddha or an Arahant attains the same Nibbana.