Here’s a good technical paper about solar plasmoids: https://arxiv.org/pdf/1704.04881.pdf and here is one about the role of plasmoids in the formation of stars like our sun: digital.csic.es/bitstream/10261/25867/2/articulo17_2006_ingles.pdf
A plasmoid with matter moving close to the speed of light would look like the M87 image if its axis was pointed close to our line of sight. Observations indicate that M87’s axis is indeed pointed to within about 15 degrees of us. https://academic.oup.com/mnras/article/395/1/301/1080009
But a plasmoid seen from the side, 90 degrees from its axis, would look very different, like a crescent moon. The object at the center of our galaxy, called Sagittarius A* or Sgr A* is viewed from the side. So far, astronomers have observed no hint of the “black hole shadow”, the doughnut shape they expected to see. For example, the images on p.11 of this paper from November, 2018, https://arxiv.org/abs/1811.08394, show no shadow at all. (No crescent either.)
Could an “almost black hole” (ABH) and a plasmoid co-exist in the same object? Perhaps—if the ABH was much smaller than the plasmoid. A large one would disrupt the flow of current through the center of the plasmoid. A plasmoid with about equally-powerful gravitational and magnetic fields, rotating at perhaps one third to two-thirds the speed of light is the most probable configuration, but more detailed calculations and observations are needed for certainty.