is it considering "recovering" even if you are not stunned?

I am asking because i wanted to know if will o basically gets +1/+1 every recovery phase he survives or just when he is stunned that turn.

if the case is, "no, he cannot be stunned" then could I evade with him once during the attack phase. then durring recover him stun him again on the chain to boost him twice in one turn?

Will o the Wisp recovers every time he is turned face-up after being stunned. So, yes, you could evade him, then use the recovery given by the evasion effect and then evade him again and recover him as your one-per-turn and have a net gain of two +1/+1 counters.

Can you spell out the timing of how this "double recovery" works?

ok

you evade will o wisp right (evasion means that at the start of the recovery phase that caracter will recover, right?)

so anyway, at the star of the recovery phase when he recovers, you evade him again. in the wrap-up step of the recovery phase you recover him as your "once-per-turn" guy to recover, thus WoW recovered twice that turn getting 2 counters

Will o the Wisp evades before the Recovery Phase.
At the start of the Recovery Phase, an effect goes on the chain that will recover Will o the Wisp.
When that effect resolves, Will o the Wisp recovers and an effect goes on the chain that will put a +1/+1 counter on him.
Either before or after Will o the Wisp gets this counter, Will o the Wisp evades again. Since the recovery phase will not start again, he will not automatically recover, but you can still choose to keep him as part of the 'wrap-up' When you do, an effect will go on the chain above 'draw 2 cards' in the Draw Phase.
When that effect resolves, Will of the Wisp gets his second counter.

(note that this is typically how Electric Eve is used as well.)

I'm actually a little more interested in using this trick with the Creeper. I hadn't even heard of this before now.

I've been here since the beginning and I still seem to learn something new about this game every week. :)