I don't like the way Okayu's irses look. As far as iris designs go, I think Mel's and Reine's are the best, but Okayu's look like someone just drew two kaleidoscopes onto her face.
The same can be said for Subaru, honestly. Her irises have about five completely different colors and it seems this was only done to match the clashing nature of her outfit. It's unique but it pulls me away from watching her.
It's not like the other members of GAMERS have this problem. Mio's irises have a nice amber glow and the only issue is that she always looks like she's squinting. Korone's irises aren't the focal point of her eyes, but rather the hunter shape her eyeliner makes; and Fubuki's irises, while completely disjoint from the rest of her entire design, actually help to make her emotes pop out more.
It's not that a busy design can't work. Polka, Baelz, and even Ollie have great irises. With Okayu in particular it just does not sit well with me. Perhaps the intention was to make her eyes super emotive to serve as a foil for Fubuki?