Winter Lissa, keep or fodder off?

Looks like you already answered your own question there.

If you really like Winter Lissa or plan to use her, then keep her! Otherwise, a Brave Bow + Bold Fighter H!Jakob is really powerful stuff to deal with.

Note that in the long-run, investing in a fully merged W!Lissa is going to be a lot more difficult due to being a limited seasonal. There are more sound budget options that fit the green-axe armor role.

its up to u, great fodder, but she is limited unit. hardin is in summoning pool for yolo pitybreakers, and jakob does just fine with wary/vengeful fighter so dont really need the bold unless he is mostly playerphase. lissa has nice bulky stats in def/res/hp with meh atk compared to the base 40 axe armors we been getting lately and middling spd that sits awkwardly at 30. not really high to double or prevent doubles. still a pretty fun tank to have

I think it depends on her IVs. If she has good IVs it'd be worth it to hold onto her. If she doesn't you could always hold onto her and fodder her off onto a unit that might need her skills. 👍

I got W!Lissa too, she's +Spd/-Atk, so i would fodder BF 3 to Effie.
But first im going to farm hero merit for her.