What are your tips for making a character instantly likeable?

I've been thinking about character introductions and starting stories lately. I'd like to hear what people think makes a character likeable very quickly, or what characters you guys have liked right from the start of a story and why you think that may be. Thanks to anyone who answers this, wether your giving advice or sharing a cool character you've always liked! (by the way just an edit, but when I say likeable I mean "enjoyable" to the reader, compelling and such, not limited to just a "friendly person". Ehehe)