Jax really likes Gangle, he just expresses it badly

Episode 1, saved Gangle and Kinger from the abstraction monster by pushing them down the adventure hole

Episode 2, made sure gangle was included and actually played the game as intended

Episode 3, threw gangles mask into what the ghost said was the friendly adventure

Episode 4, playing softball with gangle, didn't freak out on gangle even after he was tortured and bored. openly told her she didn't like how she was acting with the manic mask, actually saying that he likes her better when she's sad

Episode 5, made Gangle the fist playmate in poacher's paridise, and made her the new zealand terrorist to keep her involved with the game, and showed how concerned he was with Gangle's ability to be happy

Jax is a great friend to Gangle, without him she wouldn't take part in the adventures and would have abstracted by now