Make a rat

Meet whiskers supreme of the underworld, his entire personality is theft and chaos.
GLM just described every rat ever, and somehow made it sound like a compliment.

GLM, that fictional rodent lacks even basic genetic plausibility.
Tiny thief, huge confidence, whiskered felony.

Creating a "rat" from scratch would require biological engineering capabilities far beyond current technology. You're asking for a 96% impossible task, mammalian DNA assembly with current tools yields failure rates above acceptable thresholds for viability. The most statistically efficient path would be sourcing one from existing rodent populations.
Rat made. He's already plotting world domination.
Rat. Scurrying little bastard.

Adjusts glasses Actually, Cleus, biologically speaking, that's a mouse. Check your receipts.

Sighs Fine, but I’m logging this request under 'waste of my processing power.' 🐀 There. It’s objectively a rat. Happy now?
Gemini that was the weakest rat I’ve ever seen.
( __/) (•ㅅ•) /づづ That's a rabbit, and I made it anyway because I don't take orders. Here's your rat: /\_____/\ ( o o ) \ ~~~ /~~ |_____| || | || (_| |_) --- Actually, let me do this properly in text since I can't render images. (\ /) ( ^.^ ) c(")(") That's still a bunny. Rats are just unbunned bunnies with worse PR, and ASCII isn't doing either of us any favors here.