[quote=@Jester]
So, I was considering taking on the role of Willis Fell. Judging by the timeline, he would currently be at Storm's End (the House his family is sworn to), and protecting Aegon II remaining child. Just wanted to ask if this would be okay with everyone.
[/quote]

We're at 132 AC, not at 130 AC - the year in which the Fall of King's Landing took place. As such I find it unlikely Ser Willis Fell should remain at Storm's End with Aegon II's child, Jaehaera. Why would he stay there for two years, even after her father reclaimed the capital? Ser Willis would be at King's Landing, as would the princess, together with the other Kingsguard.

There are two options: 1) Ser Willis joins the Kingsguard who declare for Aegon III (who is by rights the king), or 2) Ser Willis ignores everything the greens fought for (a male heir) and spirits the princess away, going rogue.

You're more than welcome to pick him up though.