Bamsi Beyrek

Bamsi Beyrek was an alp of the Kayi Tribe with Ertuğrul since the beginning. He and his brothers Doğan and Turgut Alp were loyal to Ertuğrul and the tribe. In season 3, Bamsi met Helena, a Byzantine princess from the Karacahisar Castle, who later converted to Islam and changed her name to Hafsa Hatun when she married him.

Personality
Bamsi is a very silly man, especially when compared to the other alps who can be very grave. He is always the center of some very comedic moments in the series. He is also quite sensitive at times, especially when questioned about his love and marriage.

He has also been shown to have quite the appetite, and will eat lots and lots of meat and honey. He can also have quite the appetite for battle, as he gets very excited for battles and fighting. He often said that he is married to his swords.

Plot
At the beginning of season 2, Bamsi was missing from some episodes because he had gone off to the mountains to train Dundar and Yiğit to become Alps. Fortunately, he reappeared soon in the season and was a pivotal point for the tribe's success.

Then, late in season 3, Doğan was killed by Vasilius and Ural. As Doğan was Bamsi's brother, the death saddened him entirely, and he swore to get revenge. Season 3 is also where his marriage to Hafsa Hatun occurs.

Ertuğrul
Bamsi was always good friends with Ertuğrul, and he fought powerfully to defend him. He was one of Ertuğrul's best alps.

Hafsa Hatun
Bamsi loved Hafsa Hatun very much. When Vasilius was trying to marry her to become the Tekfur, Bamsi came as soon as she called for help. They took her to the tribe, and the marriage set about. She encouraged Bamsi to try new things.

Doğan Alp
Doğan Alp was Bamsi's true other half. That's not to say they always got along though. Doğan often poked fun at Bamsi for eating a lot, and also sometimes being a little daft. But they were always together, and when Doğan died, Bamsi made sure that Vasilius and Ural died.

Turgut Alp
Turgut Alp is Bamsi's brother, but it is unknown if they're actually related. Bamsi gets along with Turgut well, and Turgut often has to stop Bamsi and Doğan from being too rowdy.