Who is Red to Lizzie? Well, TPTB presented their relationship quite ambiguous. They were some scenes which were quite 'paternally'. OTOH, the producers told repeatedly he isn't her father as well as Red himself answered that question with 'no'. Apart from that, only the thought of any father looking at his daughter as Red did now and again... well, let's not go there. In contrast to emotionless Lizzie and hence Megan Boone's non-acting, James Spader knows what he is doing, acting-wise, means his gazes or other expressions of emotion are deliberately and surely requested by TPTB. Showing the burn scars at the end was yanking the chains of ... well, I am not sure of whom exactly. It was a poor choice on the part of TPTB, IMO.
Anyway, I wouldn't mind at all if Lizzie would disappear for good somehow, together with her creepy husband, mind. Nope, I am not a fan of Tom, not at all. If I had my druthers he hasn't survived the shooting. Case closed.