Name units, lists and experiences where you were just having fun losing. A unit or list that you don't care if it succeeds at it's mission cause it's just so much fun to put on the table, if it dies attempting to do something the better. Or maybe it just fails roll after roll and it doesnt piss you off at all cause a unit or list or experience on the table is bringing you something more valuable than winning, joy.
Daturazi. I enjoy these raving maniacs a lot. I have a tendency to sort of roleplay them a lot of the time. I think "What would a Dat do here?" rather than "What is objectively the best play here?". The answer is usually "Swing the axe!". It results in some sub-optimal plays but it entertains me.
Always Daturazi. They've always been good, but I often use them as my main attack pieces, even when thats a bad idea. If I see an opening for them its hard to resist running them up the table and wasting all my orders slaughtering whatever they can get close too.
Also, Igao. Nothing like infiltrating a CC23, MA3, CC -3, CC: Shock+DA, Stealth+Eclipse murder machine at half line and then see the opponent's face, because OH LAWD HE COMIN' Is he gonna die? Probably. Doesn't matter.
Kiuutan with E/M mines. Unmasked, but with both bug and mate, as a last piece close to where the enemy Core is. Hell, he's gonna die for sure, but he will take A LOT of dakka to go down, plant a few E/M mines and possibly Isolate somebody. First time I used him like that, my opponent lost about 8 orders to kill him, after which his unrecoverable remains were surrounded by three mines and I had forgotten that, while trying to isolate the enemy LT was kinda hopeless (damn Brigada in core with a Tinbot Evader), I could have deployed the Mirrorball. Also, Achilles AKA Blondie-Missile... or the Proxy Mk2 with HRL (she dies a lot, but also... she has killed more TAGs as an ARO piece than all my other units in ARO combined XD)
Kanren, kanren, kanren, sforza, taowu, sun tze, rui shi rui shi, lu duan, lu duan, holomask spec op Because a courtesy list of 12 Sun Tze and 8 Rui Shi hilarity is matched only by how ineffective it is at accomplishing anything.
Domaru Butai, although I have not tried since the uprising, there was something special about a banzai charge of multiple mecha sumurai. Worth it for the times when just one one connects with their lines and the body parts go flying. NEVER FORGET WHAT THEY TOOK FROM US
Orcs, Bolts, until they became actual good. I've always loved them for their sculpts and simplicity, so kept trying and trying... and hey, they did work from time to time!