This teacher is gentle and amiable, and all the students like him.
Tips
usage
可亲 is almost always found in the set phrase 和蔼可亲 (héǎi kěqīn — gentle and approachable), which is a very common description of a warm, friendly person. It rarely appears alone in modern usage.
memory
可 means 'can/able' and 亲 means 'close/affectionate' — someone who 'can be approached closely', i.e., approachable.