first beast master would limit job
Paladin/Dark knight/Gun Breaker/ Warrior: one beast master has done acheivement for these mount they would have access to tame the pet of same skin or mobs of they family
beast tribes that give animal mount: would give access to tame they mount as pets
there two approach to beast master pet one could doing first the gave the younger of full grown pet this star wars galaxies approach.
or they the ideal that warrior of light abilities allow her to commune with beast as expansion to her gifts. let go this aproach with animal usualy you have show your an alpha to tame them. so let say the beast master must low they pet health to 25% to them they use ability let called commune with the beasts
size base roles
first small animal are dps squrril to monkey are ranger dps* only pet allow in cities to reduce lag
large base beast like lion tiger bear drake are melee dps.
gaint beast are tank base like mammoth t-rex tritops* will shrink to fit in dungeons that beast master runs can't have a gaint beast fill up whole dungeon now can we.
AI is trick one what should be basic off i suggest it be basic off the Scion AI i think SE should make so Squardon could doing dungeon with the players in the dungeons you don't need a new AI system when you got your Squardon sit and collect dust use them instead make a whole new AI system to run with players in much need dungeon use the Squardons add some fancy achievement to get them all way past stormblood add heros character to fill the role when need like trust system or have you call them for duties and aid in trust or have so once you unlock heavenward and storm blood and other expansion you use Squardon in same dungeons