It's Ogun.
She regularly shows her martial arts skills in fights. She also occasionally shows her sneakiness. One of my favourite examples might've been the Girls School From Heck arc in Excalibur. The other girls go out on a lacrosse field, and don't notice Kitty standing right there. She says it's an old ninja trick.
So it's something that depends on the writer. Some make more use out of her ninja training than others.
X-Men X-Pert, my blog where I talk about X-Men comics.It's a mini-series. Kitty Pryde: Shadow and Flame. Came out back in 2005. It was pretty good.
X-Men X-Pert, my blog where I talk about X-Men comics.Lockheed is awesome. He might be one of my favourite characters. I want more Lockheed!
X-Men X-Pert, my blog where I talk about X-Men comics.Kitty's my favourite character, so I'll never say no to more of her. But I'm fine with Lockheed anywhere. He was good in Kieron Gillen's S.W.O.R.D. mini a few years ago. That also had Death's Head. Gillen's also using Death's Head in his Iron Man series.
Gillen clearly loves some Death's Head.
X-Men X-Pert, my blog where I talk about X-Men comics.

Has she actually ever done anything that a ninja does? Writers don't seem to focus on that aspect about her despite that Ogun (Or was it Ojun?) incident.