No. 1: the person will be left thinking "he/she is very funny, but there wasn't that spark there, he/she reminds me of my hilarious uncle, cousin, brother or bredrin". . . and
No.2: if you do ever bring up the topic of getting a bit closer to the person, they probably won't take you seriously. You're not there to be free entertainment!
Don't waste your time faffing about trying to be overly likeable, and sweet!
and finally. . .
3) "I find it really easy to talk to him but there is no spark"