How to identify red flags if any?

Ask him if he is passive or active. This will help you to know him better. If he is passive, it means he keeps things in his heart and doesn't speak to them because he doesn't wanna hurt you (and nooooo please don't feel unattractive to such guys who care about you soo much that they don't open their heart, but rather make them feel comfortable and heard, secure @Hibernate )

Alien?!

Too good to be human!!! Yhi red flag hai🤣. .... Make him comfortable in your space, red flag se ki nadi bahegi

Spend more time. Face different situations and see his reactions.