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Some TMNT stuff really isn't for little kids.
Janine Melnitz is the office manager for the Ghostbusters, and also an ally of the Ninja Turtles in the IDW continuity.
In Teenage Mutant Ninja Turtles/Ghostbusters, after the Turtles and April O'Neil entered her dimension, Janine befriended the young woman and assured her that there was "nothing so weird it can't be overcome." She then alerted the Ghostbusters about Chi-You's attack on a hockey rink, and his subsequent appearance in Chinatown. When Chi-You invaded the Ghostbusters' headquarters, Janine fought some of his thralls with a Proton pack.
In Teenage Mutant Ninja Turtles/Ghostbusters 2, Janine brought Donatello a delivery of extra weapons from the Kung Fu Hustle Supply Emporium, and expressed concern about his well-being. After the Turtles' meeting with Tang Shen, Janine hugged Michelangelo and said that she wanted to hear all about his encounter with his mother. And before the Turtles departed for their own dimension, she asked them to say hi to April for her.