We first meet this character as a bumbling butler of Ciel (see-ell) Phantomhive's aunt, Angelina Dalles.
When Ciel and Sebastian investigate the Ripper murders, they find out that Grell isn't a human at all and in league with the aunt, who is behind the murders
He is completely off his rocker when it comes to blood and Sebastian. He makes sexually veiled comments about wanting to be with Sebastian. He is somewhat effeminate and very flamboyant.
He is the gif playing in my theme reveal.
When he first appears, he is very aggressive when it came to taking over the planet and of everything, but he calms as the show progresses.
The belt across his chest contains a picture of Natsumi (naht-sue-mee), which is revealed during one of the episodes. He was defeated in combat by her during their first meeting and loves her soon after. Without the belt, he becomes a useless wreck.
Gowther is the one of the strangest of the Seven Deadly Sins. He is the Goat Sin of Lust, which is strange because he has no idea about emotions nor does he comprehend them. He is fun to watch as he interacts with the others. He asks the strangest questions and is very contemplative. He has a cruel streak at times.
We first see him disguised and wondering around with a suit of armor. Later we learn that it was his armor and he was protecting the creature inside from turning into a demon completely.
In one battle, his head was severed from his body but he still lived. This even surprised his comrades. Only one of the Sins knows Gowther's true origins.