In the first line Adrien is excited because there was an akuma the day before as well as the current day for him, so he gets to see ladybug two days in a row, but Plagg is being a baby and complaining about having to fight so much.

The second one he's trying to be brave and tell ladybug how he feels and give her a gift that he and Marinette had made together, and Plagg is unertain that's the best thing to do after he and MArinette spent time together making it, and she had just confessed her feelings to him but he turned her down, so his tone is probably a little bit sad at first and should evolve into confidence that he's doing the right thing.

The final one is as Chat Noir and he see's how Ladybug is upset, and so he's trying to get her to play a game with him but she refuses so he started to challenge her and be full of himself/over confisdent in a silly way.

Link to first comic line: 

http://sleepysundae.deviantart.com/art/ML-Comic-Ch-1-Pg-7-608458826

Link to second and third comic line:

http://sleepysundae.deviantart.com/art/ML-Comic-Ch-3-Pg-7-635858288