"Raf is a big romantic," said Mariano De Martino, who has known Sollecito since the age of 7. De Martino said that Sollecito would occasionally smoke hashish, but that "he never actively looked for drugs."
In their testimony, Mofetta and De Martino said Sollecito never became violent while under the influence.
Both men were asked about a small knife Sollecito was known to carry. Kercher was found with her throat slashed. Prosecutors have suggested that a kitchen knife found in Sollecito's apartment is the murder weapon, but the knife Sollecito carried was described as much smaller.
"Raffaele wore his knife as a garment," said De Martino. "He always carried it in his pocket or hanging from his trousers by a hook, but he never showed it off."
Mofetta agreed. "He used it to cut fruit or pizza. He didn't want anybody to touch it, he was afraid we'd get hurt."
Prosecutors contend that Knox and Sollecito stole Kercher's credit cards and cash, and staged a break-in to paint the murder as a botched robbery attempt. Guede has a record of petty crime, including theft. Victims of his crimes say Guede threatened them with a knife.
Both Knox and Sollecito, who face life sentences if convicted, say they are innocent. A verdict is expected in the fall.
Knox's mother and younger sisters were in Perugia to support their sister.
"Amanda is innocent and when the trial is over, she will certainly come back home," said Knox's younger sister, Deanna, 20.
With reporting from Perugia, Italy, by Enzo Berett and Malaika Bova in London.
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