pawsplay
Hero
I can think of reasons why someone would pick Animal Affinity and Acrobatic. One good reason would be if you want minor abilities in those areas, but they aren't class skills. Has he maxed out his mage skills like a good little Napalm Merlin? If so, I think he gets a pass.
Now, another possibility is that he has no idea who his character is. You're thinking "suboptimal," but maybe the problem is that his character concept is too difuse. He just pictured his guy doing a back flip on a pony and went with it. I've seen this most in newer players, but I've also known a few old hands who just take pleasure in doing very strange things. Like the halfling cleric with Improved Unarmed Strike and profession (bartender), a superhero who gained his powers in a "freak textile accident," or a human barbarian purposefully knocked off of Shee-Ra. Or that guy on wizards.com who wanted help on optimizing a "dwarf wizard bard oh and I heard Tumble was good. I'd like to be good at fireballs and melee."
It's also a possibility the player would like to play a trick rider, and got drafted, guilt-tripped, or distracted by shiny books into playing a spellcaster.
Now, another possibility is that he has no idea who his character is. You're thinking "suboptimal," but maybe the problem is that his character concept is too difuse. He just pictured his guy doing a back flip on a pony and went with it. I've seen this most in newer players, but I've also known a few old hands who just take pleasure in doing very strange things. Like the halfling cleric with Improved Unarmed Strike and profession (bartender), a superhero who gained his powers in a "freak textile accident," or a human barbarian purposefully knocked off of Shee-Ra. Or that guy on wizards.com who wanted help on optimizing a "dwarf wizard bard oh and I heard Tumble was good. I'd like to be good at fireballs and melee."
It's also a possibility the player would like to play a trick rider, and got drafted, guilt-tripped, or distracted by shiny books into playing a spellcaster.