Strong words against Nymph. I don't dislike her quite as much as I dislike Sohara but I can certainly see where Ryllharu's coming from, she's a grotsky little biotch for sure.
I did manage to have a little sympathy for Sohara for once though. At first I thought she just wanted to 'correct' Tomo to make him more appropritate for her feelings but this episode made it seem like she has a general big sister complex. I'm guessing she gets off on being the 'mature' one and having others dependent on her somehow. I can't really fault her for that mentality as she may simply want to feel needed or important. I can empathize with her being marginalized by the Angelroids as well as Tomo's indifference to her, but I'd rather she just recognized that he wasn't into her and moved on.
Nymph's comments about Ikaros were quite interesting though, apparently she 'ruled over the Synapse' at some point in the past. My snap theory is that she wasn't a literal leader but the head enforcer/strongest loyal angelroid to whoever was in charge. Perhaps Nymph is working for someone who wants to or has upset the power balance wherever Angelroids come from and is there to make sure Ikaros stays out of their way.