• 自分じぶん — oneself
• 自動車じどうしゃ — automobile
• 自由じゆう — freedom / liberty
• 自信じしん — self-confidence
• 自営じえい — self-employment / running one’s own business
• 自在じざい — freely / at will
• 自重じちょう — self-restraint / exercising caution
• 自みずから — oneself / personally
• 自画自賛じがじさん — self-praise / praising one's own work

The character 自 originally depicted a nose — an ancient way of referring to oneself. It's now widely used in modern terms for personal identity, freedom, and voluntary action.