Is the higher self static or dynamic?

[anagogy]

Can the higher self be thought of as a guardian angel?

Ra has stated that the Higher Self guides when asked and protects when possible so I see no harm in considering it to be your "guardian angel".

And do we get to see our higher self in time/space when we pass over?

36.10 Questioner: Well, let, let me be sure I understand this then. Would… We have spoken of certain particular individuals. In… For instance, we were speaking of George Patton in a previous communication. Then his higher self at the time of his incarnation here as George Patton about forty years ago, his higher self was at that time sixth-density? Is this correct?

Ra: I am Ra. This is correct. We make note at this time that each entity has several beings upon which to call for inner support. Any of these may be taken by an entity to be the mind/body/spirit complex totality. However, this is not the case. The mind/body/spirit complex totality is a nebulous collection of all that may occur held in understanding; the higher self itself a projection or manifestation of mind/body/spirit complex totality which then may communicate with the mind/body/spirit during the discarnate part of a cycle of rebirth or, during the incarnation may communicate if the proper pathways or channels through the roots of mind are opened.

So yes, you can see and communicate with your Higher Self after your physical incarnation.