Yoda's abilities are great, but they are more time sensative than most other characters. I have noticed that when in Arena battle, the Yoda AI (like most characters) will expend a Special Attack for the first round. In Yoda's case, his 2 Special attacks are more useful when his opponents have less than 50% health, or have buffs, which are not common in the first attack of the game (he is often the first to attack at speed 150+). This leads to him wasting Special Attacks when not needing.....while his Basic attack is perfectly suited to attack opponents with high health, such as the opening attack of a match.....(gain foresite and turn meter)
Unfortunately his AI is set to use his special abilities in the opening turns, and not his Basic Attack. (which sets the tone for his proper use as an evading-support player). Yoda's advantages in Arena Play are quickly negated, and can be easily defeated in the first wave of attacks (with my own Yoda) without his very useful Fore-site Up....
All I am suggesting is that his first attack should be tweaked to be his Basic (Ataru) attack, then he can expend his Special attacks in the turns to follow, when they are far more appropriate and useful in the Arena, making him a far more desirable character to possess.