It must be karma

The first thing I thought when Yzak's console exploded in his face was "OMG! Dilandau reincarnated!". Helps that they're both silver-haired, maniacal mobile suit pilots with a major grudge against the protagonist that dared to scar them. Look! They're both even wearing red and working for organizations that start with "Z---"!

It must be karma.

Van and Dilandau are from Vision of Escaflowne and Kira and Yzak are from Gundam Seed.