It was subsequently announced that she would join EastEnders due to positive reaction to the character, and made her first appearance in the soap on 31 May 2010.

In series 1 of EastEnders: E20, Mercy, who is friends with Fatboy, is trying to create a project for the local church with the youth minister Benjamin (Damien Lynch), to attempt to bring younger people to the church, and if it is successful, Mercy's grandmother (played by Jay Byrd), will fund her university place.

Mercy, along with the others, ends up squatting in 89b George Street, where she takes a pregnancy test and then tells her grandmother she will not be coming home.

Knowing they can no longer stay at the flat, Fatboy invites her and the others back to his house but she decides to return home to her grandmother.

Several months after the events of E20's first series, Mercy attempts to contact Fatboy as she has returned to Walford following a visit to her parents in Nigeria.

After an argument between Mercy and Fatboy, she pushes him and he falls onto a tree planted in memory of Trina Johnson (Sharon Duncan-Brewster), breaking it.

At a New Year's Eve party, Mercy kisses Fatboy to put Kim Fox (Tameka Empson) off flirting with him.

As the party continues, Fatboy cuts his finger and Kim starts to crawl along the bar offering to kiss him.

She takes a liking to Seb Parker (Tommy Bastow), which leaves Fatboy jealous, and later he accuses them of having sex, to which Mercy does not reply.

She then reveals she may face deportation as she only has a Nigerian passport and her visa has expired but she has lived in the United Kingdom since the age of nine.

Seb ends his relationship with Mercy, and then she is approached by Daniel Mansard (Richard Galazka) from the Agency, saying she is four months past her permit.

Mercy is one of four characters created by a team of 13 writers aged between 17 and 22 for the Internet spin-off series EastEnders: E20.

[2][3][4] The characters were created in August 2009 and open auditions were held for the cast at Theatre Royal Stratford East.

"[10] Mercy and her grandmother Grace's introduction to EastEnders made them the first Nigerian family to appear in the series.

"[14] The character often wears a yellow jacket and has a red hair weave, which Mojekwu said, "didn't look too great".

An EastEnders spokesperson said "Bunmi has done a great job of bringing the role of Mercy to life and we wish her every success in the future.

[11] In October 2011, Mojekwu was nominated in the Young Shooting Star (16–23) category at the Screen Nation Awards for her performance as Mercy, which celebrate the best British Black talent.