When the other person says "long time no see", you can respond with the following 15 humorous words:
1."yes, I almost don't even recognize you!Are you avoiding me?”
2."Don't come unharmed, it feels like I haven't seen you in a century!”
3."Haha, did you secretly go for plastic surgery?”
4."It's been a long time, and I feel like you've become more handsome than before!”
5."You definitely don't want to see me, otherwise why haven't you shown up for so long?”
6."Shouldn't we get acquainted again?After all, it's been a long time!”
7."You must have other friends who don't remember me!”
8."Don't come unharmed, I can't even remember what you look like!”
9."Long time no see, have you become a superman or an alien?”
10."You must not dare to see me, for fear of falling in love with me!”
11."You must have other more important things to do, like saving the world!”
12."It's been a long time, have you secretly gone to study?”
13."Don't come to harm's way, I'm almost forgetting your voice!”
14."You must have other better friends, you don't need me anymore!”
15."Don't come to harm, I'm almost forgetting your smile!”
These are some humorous replies, which can be adjusted appropriately according to your relationship and context.