Is it permissible for me to take virtual assets from my account that was banned after my friend betrayed my trust, and if it is not permissible for me to do so, can I donate them as charity because they distract their owner?

Electronic games are impermissible unless they are free from Sharia prohibitions. As for what your friend left in your banned account, it is not permissible for you to take it or donate it without his permission, because the Messenger of Allah, peace and blessings be upon him, said: "Indeed, nothing of a Muslim's property is lawful for another except with his willing consent." Therefore, you must return the items to him or inform him about them.