How do you act like Gin Ichimaru?

Act happy and funny when inside you're actually deadly! Remember how Rukia feels like there is a snake wrapped around her neck just by his presence. Have no mercy, tease people at any time. (Please don't be like this in real life)

Smile, have your eyes half open and never take anything seriously! Act weak but be deadly on the inside! If you saw him you would think he smiles so much and he looks so weak, but he isn't really! Be friends with most people. If your cheeks hurt too much you could stop smiling. Don't move your arms much, you keep them held behind your back or sides! I Love bleach!

His attitude was 'smiley and ironic' because he had dark in his soul and tried to escape from it like that. Gin is compared to uchica itachi.