Why did I choose "SpongeBob SquarePants":
Firstly, because it is a cartoon known by all (or almost) and whose gifs are very often used on social networks and messengers.
Secondly, because the characters of this show are very expressive of the face what gives a very relevant result with regard to the emojis requested for the contest.
Thirdly, because it is a very colorful cartoon which makes it very visible in a list of gifs, and also because they are solid colors, which gives the possibility to compress the videos in a more important way without losing too much quality.
And lastly, because most of the clips can be looped perfectly and infinitely.
N.B.: I regret however that the addition of the watermark on some videos leads to a complete change of the video size.