Bella Ramsey

The reason Lady Mormont works is because it's a well written role with a compelling character arc. Young Bella is asked to do very little other than recite a line or cast a knowing glance. The character never shows weakness or doubt and dies in a heroic manner. Good casting.

Bella is bad as Ellie not only due to sloppy and sometimes unintentionally comedic writing - but also because the role requires acting chops. Bella Ramsey can't act their way out of a paper bag. Bella not only struggles to convey a convincing Ellie but struggles to resemble a convincing human at times.

This is why they didn't cast the fat kid from The Goonies that does the truffle shuffle as Batman, because it wouldn't have worked.

I watched some clips of The Last of US. She is doing so good, one scene is from EP6, Ellie and Joel are sleeping in the wild. Joel promised to be look out but fell asleep. After Joel woke up, he found Ellie was on the watch. Joel blame her she should not do the watch. How bella acted is great, the smile, the eye contact. It totally reflects the character, a smart, arrogantly adorable little girl.

Later I found out she was also in the TGOT as Lyanna Mormont. The scene S6E10, Where she gave speech to defend Jon Snow is one of the memorable parts for me. The courage, the determination are there

What a great actor!