Honestly i think that i prefer this boy's design over tanned Youmu. He has that quirky charm and originality, i like it.
Also his name has multiple reasons behind it - Allister is obviously reference to Aleister Crowley, famous english cultist, ritualist etc. but also it's gaelic form of Alexander, "defender of mankind" (like in protection from evil spirits etc) and Allium, genus of plants like Onion, garlic, leeks.